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Discussion Starter · #1 ·
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.
 

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Whistles go Whoooooooooo
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Discussion Starter · #4 ·
I will check on the plug wires. And I am sure the opti is indexed correctly. I didnt think it would run/idle well at all if the opti wasnt indexed right?
 

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Discussion Starter · #6 ·
I am hoping right before the opti went out i filled up with bad gas. I will drive it down and put in some good gas. I am thinking thats the problem.
 
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