sounds to me like someones got a bad knock sensor 
go to autozone and have them scan it, ill lay money down that thats it
my gas mileage dropped big time... and btw... mine went at only 55,XXX miles
__________________
-Josh-
99 Nissan Frontier XE V6 4X4
-3 inch lift, 33s and a lot of fab work-
AC, Calmini, Ballistic Fab, Bilstien, KC, Shrockworks, BFG, L&P, SLR, Copperhead Fab, Pro Comp, Cherrybomb, K&N
Yeah, it's the new king of everything,
and b*tches don't say no to me, I'm like a wedding ring.
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