On my way to work today my truck decided it was going to stumble at low rpms and increase as I accelerate. It bucks and stumbles too. It started about 6 miles of driving. I still have everything stock too. I checked my spark wires, bit they haven't been off in about two weeks. I'm going to check my timing tonight too, but I'm also hoping for a few other suggestions too. Thanks guys.

 

Fuel filter

 

I actually bought a new one on my lunch break to throw on.

 

Does it run fine after you let it sit for a day or two and then start acting up after a few miles of driving fine? If so, I'm thinking fuel filter too. It happened to me as well.

 

Actually kawa, that's exactly what's going on. I replaced it last night, as well as a few vacuum lines. I also changed my fuel lines out, but I'm still getting a surge in my rpms, but the bogging stopped.

 

Fuel return line might be clogged too causing a surge. Could also be a fuel pump on the fritz. Is is a stock carb or a Weber?

 

It's still stock, I'm picking up a weber this week.

 

It's back to bogging down and the surges are causing about a 500 rpm jump. Also small backfires are increasing as well as a backfire as I turn it off. I checked my timing last night and it was fine.

 

Also, I noticed my led dome light flickering very low under the dome cover. It wasn't in tinewith the sputtering backfitres though.

 

check your easy R valve is clogged also the small vacuum port that comes out of it with the Philips screw on it that got clogged on mine and my truck is running like ˟˟˟˟ until I pulled it off cleaned it out using a pick and a drill bit

 

EGR sorry talk to text is stupid

 

I'd wait until you get that Weber installed. Trying to chase down the gremlins in an Aisin carb is such a headache. I've worked on tons of carbs before and none were as much of a pain in the ass as an Aisin. Are you going to desmog?

 

Of course, I'm in Idaho so nobody cares about smog.

 

I think you'll find that a lot of your problems will be solved with a simple desmog. I have a link in my signature to my desmogging thread.

 

I used your desmog tutorial when I desmogged my 84. It is still a subscribed thread.

 

very much so agreed I just don't have enough money to afford my Weber and desmog kit.

 

Got the weber on craigslist for $150 with 200 miles on it. I just dropped $150 on lce this morning on adapters, breathers, filters, fuel line, and desmog parts.

 

sweet score post pics once you have it all installed and let us know how it went.

 

Will do, it should be Friday or Saturday. Also my backfiring has become very rapid.

 

I was having the exact same issue it was my EGR valve and the pipe coming out of it they were all clogged up I suggest you inspect that when you do desmog it just to check and make sure that was the issue then clean it out and sell it all to somebody trying to put there's back to smog legal that way you can let your old pay for the new.