2003 3.8 bad engine miss-nightmare!
2003 mustang engine miss approx.1500 rpm. so far we have installed plugs(plat),wires,cam sensor,crank sensor, imrc actuator,iac motor,fuel pressure reg.,fuel pump,filter,pulled the converter's(pipe),stii to no avail. when we pulled the intake manifold to replace the imrc, the intake was black with soot,except for the #6 cylinder port. this was as clean as new. ? we dipped the manifolds ,and are clean as new, don't have a clue anymore. the car still idles good,but stumbles bad at 1500 to 1800 rpm.pings bad also .sounds like #2 cylinder with exhaust system off.not sure of anything any more !!!!! anyone have any more suggestions? thanks , john