2000 3.4 320,000 miles fresh plugs, wires and coil boots, new fuel filter.
Cold engine it starts and runs fine even for a couple of hours. Subsequent start and it runs rough, bad idle and will throw random, cyl 3, cyl 4 misfires. Unplug the idle air control valve and it runs fine seems to have lots more power but obviously throws a code for that.
I took the throttle body and IAC off and cleaned them, both were filthy. Problem is still there. Can’t find any vacuum leaks.
Thoughts? Sticky IAC?
Cold engine it starts and runs fine even for a couple of hours. Subsequent start and it runs rough, bad idle and will throw random, cyl 3, cyl 4 misfires. Unplug the idle air control valve and it runs fine seems to have lots more power but obviously throws a code for that.
I took the throttle body and IAC off and cleaned them, both were filthy. Problem is still there. Can’t find any vacuum leaks.
Thoughts? Sticky IAC?
