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I said this in another thread and I still believe it's number 1:
It's 1 of 2 things:
1. Either there is no problem and the car is properly setting the timing according to octane/knock. And if this is the case, then a fuse pull is advancing the timing farther than it should, giving the car some immediate seat-of-the pants extra power for a little while and gradually retarding the timing back down somewhat to match the actual octane and occurance of knock.
2. Or there is a problem and the car simply won't re-adjust to higher octane tables after it's been lowered.
I find it simply impossible to believe that once the car retards the timing due to knock, that it will never advance it ever again until fuses are pulled or GM sticks a diagnostic tool on it.
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