I Can't Believe It! New to the Forum from Texas, so "Hello" to everyone. i came across this forum by accident looking for answers to my problem with my new-used 06 unlimited, which happens to be identical to the OP by jbrunker. gonna revive it and see if anyone else knows how to fix it. Mine isn't kicking codes at all. Does that mean it is an emissions issue?
i can start replacing parts but before i do, thought i'd get this thread back in the rotation.
oh yeah, i would like to avoid replacing the catalytic converter just to troubleshoot....also, mine has only done it when shifting up from 1st-2nd, and from 2nd-3rd.