I have a friend who has a 1990 jeep wagoneer, 4.0l, 6i. Also lack power. New cap, rotor, wires, fuel pressure tested and spot on, TPS ratio @.832v, throttle body cleaned, IAC cleaned, searched high and low for vacuum leak (found none), cleaned EGR, MAP vacuum line cleared. Car idles fairly smooth until put into gear, then idle becomes a little rough. Upon light acceleration, get a slight backfire or two, then it tries to go, but not with good get up and go. The car goes better upon hard acceleration, after a slight hesitation. Any ideas? Thanks !
Saturday, January 28th, 2012 AT 2:37 AM