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if it goes faster as your rpms go up it would be your wrist pin. if it don't and stays the same then i would check for air leak or your fuel pump behind your fuel bowl. the wrist pin on my truck has been bad for little over fivers and nothing has happen and it is still bad.
1997 f-250 ex cab: 6637 air filter, 3" down pipe to 4" pipe.
Last edited by bluetickman; 01-01-2013 at 07:34 AM.