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41 Posts
I had my opti go out on me on a 95 lt1. Swapped it out and went for a test drive. I am now getting spark knock that will rattle your teeth. I have a custom tune in it but didnt think that would cause this much knocking. Anyone else had this problem before?
Runs fine at idle and cruising. But hit the gas and its bad.
Runs fine at idle and cruising. But hit the gas and its bad.