Thought of something.
Unhook the timing advance wire before a cold start and see if it runs smooth but sluggish.
Mine would, and that led me to believe the timing was being overadvanced.
Sonny
I see you replaced the distributor. Did you replace the Ignition control module ?
I just went through this exact same thing with my 91 TBI and replaced all the parts you have ( except the distributor) and finally fixed it when I replaced the ICM.
Truck ran great on a cold start above about 50...
I thought of something.
Since the engine does not miss/ stumble at cold start with the ESC wire disconnected, are there any other sensors that the ECM "ignores" with this wire disconnected and returns the setting back to a predetermined value?
Thanks,
Sonny
Update.......You guys are on to something.
Here is what I have done and what I have found.
I have:
Removed wires cap and rotor. I polished the distributor stem and reinstalled cap and rotor. Reinstalled wires per the Service Manual and ensured 5 & 7 wires are routed apart from each other...
I must be missing something here, but I am about out of ideas.
I have a 1991 c1500 5.7 tbi with 115,000 miles on it. The truck misses for about 30 seconds after start up when the outside temperature is below 50 degrees. I have done all I can think of to this point and need some others opinions...