LBZ rumbles at idle/bad mpg

Louisianarebel

New member
May 8, 2008
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LA
My friend has a lbz that he bought used. Then we found the egt probe in the exhaust and it would smoke a little when he would floor it.
I figured the last owner left some tuning on it and he got it reflashed at a dealer, so now it rumbles at idle most the time instead of the hiss rumble hiss.

Heis only getting 13-14 mpg with it now, when it was getting 17-18 before the reflash.
He tried to put a quadzilla on it and it wouldnt work, quadzilla still couldnt get it to work, my ppe wouldnt work either.

Im lost. :help: