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Wow,I am at my ends with this.Today I got the car back together after pulling the tpi,runners,and egr off.I found that everything was full of carbon.So i pulled it all apart and cleaned it up real good.Then put it back together and ran some sea foam through it and replaced the spark plugs.Well...

Ok what I thought was a nice car has some issues.I just bought this 89 corvette(well traded my jeep for it)And am having some issues.I have another post for the no spark issue,but here is the one for maybe egr problem and maybe the answer to my bad pinging.With car not running I put a vacum pump...

Ok here is the run down.I just got this car(89 corvette)when I test drove it I noticed a pinging.The owner said it had cheap gas.Anyway guy had just had new injectors,egr,and battery done.I bought car toped off the fuel with supreme(only 9 gal)+ onl bottle of 108 octane booster.Still pinging...