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TPI HELP
I have a 91 Z28 and it has a rough idle problem and after the car warms up it will not start,eventhough I have spark. After the car cools down it starts fine. It only has a rough idle after it goes into close loop. I have replaced the following items:
oxygen sensor
distributor
spark plugs
spark plug wires
egr
TPS sensor
MAP sensor
cleaned throttle body
I also have a fuel pressure gauge and pressure is holding. I am starting to think it is the ECM since it gives me problems in the closed loop operation. Any ideas would be great.
Thanks Jason
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