Well guys I have an '84 4x4 Pickup with a 22R and a 5-speed. When I got it it was in need of a carb rebuild so I rebuilt the carb, drained the gas, replaced the fuel pump, replaced all vacuum lines and it ran perfect (aside from me not being able to get it to idle down from 1000-1100ish RPMs). Fast forward a few weeks after that and it was still running great on the road, I take it out to play in the mud for a few hours and about 30 minutes in it starts to stumble/bog down (almost exactly like it will with water in the gas but the gas was fresh and I hadn't been through any water crossings) but only at low RPMS. If I gave it some gas and kept the RPMS up it ran alright but as soon as I let off the gas it fell flat on its face and sometimes even stalled. Let it sit for a while and it still ran funny but ran okay enough for me to drive home. Overnight it sat and drove fine in the morning, up until this last weekend when I again took it in the mud only to have the same issue except it happened after the first or second hole this time. Ran rough at lower RPMs all day but after it sat that night drove fine in the morning again. Any Ideas? And sorry for the crazy long description, just wanted to be thorough.

TIA Guys

 

I am contemplating this, and I presume it could be several possibilities. Fuel filter ok? Timing ok? All plugs and wires new? Distributor tight internally(no play in gears)? Cap and rotor new, no cracking? Fuel pressure good? Fuel in float bowl at proper height and stays there even when its being revved up? All fuel lines in good shape? All vacuum lines routed properly? Linkage on carb is not binding and is slightly lubed? Butterflys in carb top and bottom(throttle plates) are free and clean?

Check these things and give me a status and we can go from there... Someway, somehow we can figure this out...

 

Thanks for the reply rokblock. As for your questions:
-Wasn't able to locate an inline fuel filter at any point along the fuel line when I drained the gas from the tank, will be installing one this weekend whenever I get the chance though
-Timing is spot on AFAIK. Don't have my light to check it with (a buddy borrowed it over the week) but I set it at whatever it was my Chilton called for when I replaced the timing chain when I got it
-All plugs were replaced when I did my last oil change and I read them this morning, they're all a nice carmel color. As for the wires they weren't replaced when I did the plugs however they are relatively new and in very good shape.
-Checked and the dizzy doesn't have any play in it
-Cap and rotor are both fairly new and checked them both today as well. The contacts are clean, cap is crack free and the breaker plate and all of that good stuff was nice and clean as well
-No way to test fuel pressure with a gauge but it was flowing fine when I tested it after I installed the new pump
-Fuel level is good through the sight window in the bowl even when it's being revved up
-All steel lines were blown out with compressed air when I drained the gas and all rubber lines were replaced
-All vacuum lines were triple checked for proper routing when I replaced them. Only vacuum lines not hooked up are the 4 lines that run to the 2 BVSV's as the barbs are broken on each of them however the corresponding ports are capped off. That and there are no leaks in the steel or rubber lines that I could find with carb cleaner when I replaced the vacuum lines
-Linkage on carb doesn't bind and was lubed up when I rebuilt the carb. All linkage moves smoothly.
-Throttle plates are free and clean and function properly. That and all passages in carb were sprayed out thoroughly with compressed air after soaking in carb cleaner.

Really appreciate your help rockblok! It's great to have some input from someone else.

 

On my '84 I couldnt find an inline fuel filter either. But I found it near the tank. It was hidden behind a small rubber inner wheelwell cover, near the right rear tire. I had to access it through the wheelwell. It was all but hidden, and I swore I didnt have one. But I eventually found it by following the fuel lines inch by inch. So you may want to check there. It resides in a little circular spring-type holder. Almost on top of the fuel tank, where the lines come up out of the tank.

 

Thanks for that info. I found it earlier this morning. It was exactly where you had described. Would have never guessed it would have been there. Will go get a replacement filter at the parts store later on.

 

Getting water in the distributor could cause this also...low buck but rtv the seal ans get some dielectric grease for all the plugs and wrap the dist with a walmart bag

 

As a side note, if you put on a thin bead of RTV silicone around the perimeter of the dist cap, let it solidify before you put the cap on the dist. It will become an additional gasket being RTV, but if its solidified, the dist cap will come off easier if you ever need to replace.

 

Sorry it took me so long to ever post back guys. I was hoping to take the 'Yota through some mud over this weekend so I could report back and let y'all know how things turned out but ended up getting swamped with work. However I will say that replacing the fuel filter seemed to make it run a little smoother and I took your advice yoterr and laid a bead of RTV around the perimeter of the dizzy cap (already had die-electric grease on the plugs). Don't believe that water under the cap was the source of my issue as I never went in anything deep enough to get any water in there but it would make sense with it smoothing out after I leave the trails and it has time to sit/dry out. Will report back on the results after my next wheeling trip.

Thanks Guys!

 

Just wanted to give you guys and update if any of you were following along. Took the 'yota out Wednesday night and tore through some pretty bad holes with no stumbling before or after. Not sure whether it was the fuel filter or the RTV but she's running right again in the mud. Appreciate the help guys!