Ive looked through the same forums with no answer.Hello everyone, my first post! '94 5.7 TBI with 145,000. Truck is original and last year developed a miss/bad idle in gear. I replaced the IAC, TPS and EGR, plugs, wires, cap, rotor, still had the problem. Checked the fuel pressure, good, 13 psi. No codes. Next, I noticed that the distributor was making noise, bad bearings. Replaced the distributor and problem solved, the truck was running great! All parts replaced were Napa/Echlin. Now the temperature is dropping, and on cold morning idle surges badly for about two minutes, then smoothes out and runs like normal. I have tested the coolant temp sensor and it checks out, and still no codes.
This seems to be a common problem that has been discussed on many forums, but I cannot find a forum with a resolution or an answer!
Any help would be greatly appreciated-
Kevin Showalter
Im starting to suspect that our problem is the end result that may be caused by different issues for each of us.
Not by one thing, but the end result is a cold misfire.
Something below a certain air temp is making it try to start way fat or lean and causing a cold misfire.
But its friggen odd.
Mine starts puking at about 45 degrees
And then its done.
Runs fine for the rest of the day.
Somewhere, either in some strange afermarket part, or a ground, or an aftermarket sensor.
Something is a bit off.
And the gm dummy box cant handle it.
Solve this and I will ship you a case of beer of your choice my friend.
Its a common problem with no answer.
Yet