whats the recommended gap for NGK TR55 on a stock WS6
#5
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sometimes get correct advice from him.
what else could be causing this detonotion?
this other guy told me timing needs to be adjusted with a software tune up costing $250.
can a GM tech 2 tester adjust timing or do a tune up?
what else could be causing this detonotion?
this other guy told me timing needs to be adjusted with a software tune up costing $250.
can a GM tech 2 tester adjust timing or do a tune up?