Originally Posted by
Nycist
those things are prone to having the exhaust manifold crack. check there. also classic symptoms of a bad fuel pump. check the fuel pressure.
Thats what Im betting. Ive never seen a 4.0 exhaust mani/ header that wasnt busted down by the collector. Very common problem. Itll suck in fresh air and freak the O2s out and then wig out the whole deal.