• it could be a restriction in the air system, is it low power?check air filters,pressure chk air charge cooler for you have any codes in the ecm? plug into the ecm and run a diagnostic,the fuel is more than likely turned up. the last truck i drove that did that was a 2002 460 mack. it would only smoke when shifting ...the reason? was turned up to 115% (529HP).even grossing 82, was NOT afraid of hills.

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