My 97 tahoe was getting around 13.5 completely stock and i added a the mag catback and K&N CAI and now average 16-17 all the time around town but havent took it on a trip yet to see what i can get.Of coarse when i first put the exhaust and intake on i got horrible milage but i had fun :). Heavy...
mine does the same thing,during the summer it didnt do it because it was warm but now that its starting to be 35 degrees outside in the morning it makes almost like a knocking noise then stops after about 2 mins, i know its piston slap but sounds like a rod knock but a rod would knock all the...
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