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Possible solutions......
Inspect the intake system for air and vacuum leaks. clean the throttle body. Check the MAF sensor connections. Replace the MAF relay. Replace the ECM. ** the ECM is a last ditch effort....you have want to have the car looked at by a professional before replacing the ECM.
Hello I have another question.My 87vette automatic is showing code 34 what is that code meaning? and how is it fixed? thanks
I have a 93, and the code 34 for that year means EGR valve fault. The Shop manual gives a long procedure for troubleshooting, But I tried the vacuum test first and found that my EGR would not hold vacuum. Solution- replace EGR valve.
No idea if 87 and 93 had same fault codes. This is just a datapoint.
Good luck!
According to my 85 FSM the problem is either a grounded circuit (998) a bad ECM or a bad MAF. Suspect you have to follow an 86 manual to pinpoint due to the differences in burn off.