1991 GMC 5.7 hesitates on accel - Engine Troubleshooting


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1991 GMC 5.7 hesitates on accel

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mikkos
Novice

Oct 18, 2010, 5:48 PM

Post #1 of 4 (2274 views)

1991 GMC 5.7 hesitates on accel	Sign In

1991
GMC K1500 SLE
5.7 148,000 miles

It was running great up till a few days ago. It has new plugs, wires, rotor and cap about 300 miles ago opened up the Dist cap everything looks good.

It idles great, slight hesitation when its in the garage and I give the throttle linkage a twist. I move the throttle linkage so the engine is at about 2000 RPM and it seems good. However when I drive it slow at speeds under 30 MPH it seems OK. When I take it out and try to accelerate on the highway the engine is sluggish and seems like it is missing. But not backfiring or anything like that. More like a chugging. No black smoke noticed out the tailpipe while accelerating. Valve seals were replaced a little while ago but had driven it since then and it was ok. Doesn't appear to have any vacuum leaks??? Pretty sure all the vacuum lines are hooked up. Any advice would be appreciated.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 18, 2010, 6:17 PM

Post #2 of 4 (2266 views)

Re: 1991 GMC 5.7 hesitates on accel	Sign In

Double check the job. You may have a plug wire not on all the way or a cracked spark plug.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

mikkos
Novice

Oct 20, 2010, 5:53 PM

Post #3 of 4 (2254 views)

Re: 1991 GMC 5.7 hesitates on accel	Sign In

Once again your right on the head of that on. LOL I some how had the plug wires in the firing order of a 95 5.7 Seems to be running much better. I knew I had some transmission problems as well. I am completely missing second gear. So it shifts from first to third I think that might be the Chugging problem. Not near as bad now.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 20, 2010, 6:05 PM

Post #4 of 4 (2251 views)

Re: 1991 GMC 5.7 hesitates on accel	Sign In

Thanks for following up with the fix.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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