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· still learnin'
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Sounds like you have engine detonation, or knocking going on here.

Do you have any codes present? If so, get them read and report back. But, I suspect you have carbon build up on top of each piston.

http://www.tricktuners.com/detonation_explained.htm

I could be wrong here, hopefully someone else will chime in.

How many miles? how long have you owned it? Any mods?
 
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