Hey guys. I have a 95 GMC Jimmy. It started having a problem this morning. Under light/normal acceleration or trying to maintain speed it will miss. The whole truck jerks when it does this and loses power. RPM's drop a few hundred. Doesn't matter what gear it's in. Under heavier acceleration or if you floor it it runs fine. If you shut the truck off and let it sit for around 15 minutes, the truck will run good for a few miles after it's restarted then start running like crap again.
Within the last year I've replaced the cap, rotor, plugs, wires, fuel pump, regulator, fuel filter. It doesn't have a cat on it. I checked fuel pressure and it's within range and it holds after it's shut off. No check engine light. It has the OBD 1.5 OS in it by the way. I pulled 2 of the plugs. One of them was white (lean?) and the other was tan. Maybe clogged injector? After I changed plugs the 1st time with Autolite's it developed a miss @ idle and I changed them to AC Delco platinum's and that went away. I picked up some new plugs (Delco copper plugs) to try but other than that I'm at a loss. I'll throw those in when it stops pouring down rain. Any other ideas/suggestions? Thanks.

 

Ok here's an update. It died on me. Sputtered and then just quit alltogether. It will crank and sputter a few times but will not stay running. Checked all vacuum hoses. Coil is good. Cap and rotor good. It has a good strong spark. Distributor is tight. Still has a little over 60 psi fuel pressure at the shrader. No codes. I looked into the upper plenum and there is no washing or puddles of fuel. I'm at a loss. Any ideas?

 

I gave up on it and took it to a shop. Turned out to be the pick up coil.

 

It ran fine for 2 weeks and now will not stay running again. Open to any ideas!

 

Well, what I would be asking, is the pickup coil toast again? If it is then next step to find out what could cause that failure. But, if you had a shop do the repairs it seems they would check their work and see it the pickup is toast.