Have a 95 Z-28 , that after driving 7 miles , starts idleing with a stumble at idle. Changed coil & fuel filter. Short runs won't do it , but keeps doing it once it starts doing it.
Also sprayed throttle body with throttle body spray & MAF with MAF spray. Takes about
7 miles to act up from cold start.
Is the service engine soon light on? If so, pull the trouble codes and we can help further. HTH. -Jim
No codes & no light on. OBD 1 system with OBD 2 plug.
It could be the ignition control module getting hot and breaking down. HTH. -Jim
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