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Old 11-11-2021, 12:28 PM
74Grandville 74Grandville is offline
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Join Date: Mar 2003
Location: Plainville, CT
Posts: 1,847
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Quote:
Originally Posted by Stumann View Post
I can't believe no one has mentioned a failed EGR valve. I was turning wrenches for a living in the 70's and 80's and a bad EGR valve was always the problem.
good call out. i recently fixed my 1977 formula ping by replacing the EGR... part throttle it was really bad until EGR was replaced.

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1979 Firebird Trans Am 301/4spd (Now 428)
1977 Firebird Formula 400/Auto
2007 Grand Prix GXP 5.3L