Coming back from the mountains yesterday had a weird thing happen. Going down a steep, rocky two-track in low range,('91 runner 3.0 5 speed) 2nd and sometimes 3rd gear, when I came out of an idle on the (somewhat) smoother stretches, and held about 2000-2200 rpm, the 'Runner started bucking, just like I was on and then off and then on the gas, real fast. At first I thought it was me not being able to keep steady on the go pedal due to the rough road, but turns out that I was, in fact, holding steady. I didn't really look at the tach when this was going on, because I didn't really want to take my eyes off the road,(did I mention that the "road" was a little nasty?), but I'm going to guess the engine fluctuated about 500 to 700 rpm's. Any ideas' as to what is going on would be appreciated!
Regards, Rick

 

check your grounds; maybe one's loose and is vibrating around during the rough road traveling

 

also check for any loose or corroded connections around the igniter and distributor.
and if it happens again, look at the tach.

 

Thanks for the quick replys! I will check the grounds. I was thinking that it might be in the fuel delivery system, but I'd rather it be a ground somewhere.....easier fix!
Rick