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Help! Rough running when hot

dugr

Active member
Joined
Nov 21, 2001
Messages
35
Location
Bowling Green, KY, U.S.A.
Corvette
1994 Arctic White Coupe
I have a '94 C4 LT1. When the outside temperature is hot (80 and above), after I have driven the car, turned it off, and let it sit for 15 minutes or so, it runs rough on start up and cuts out at high rpm. Coil, Ignition module, Spark plugs and wires, and fuel filter have been changed. Every one of these changes helped (even to the point that I thought it was fixed). However, the described symptom remains. Again, the ambient, outside temperature seems to be a major contributing factor to these symptoms. I did not have this problem, last Fall, or this Spring, when the temperature was cooler. (The engine is running at normal temperature.) I am just wondering if any of you have experienced similar symptoms, and what you discovered was the problem.
 
My 93 acted this way. Try cleaning the IAC pintle on the throttle body....I had to clean mine a few times. Lot's of carbon buildup. I'm not getting a rough idle at startup anymore and it gets pretty hot here in Florida....
 

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