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If im not mistaken the number 3 coil is on the right hand side of the motor so you will need to remove the intake manifold to gain access to it. Intake Manifold
Removal
Remove the engine cover (if equipped).
Remove the air filter outlet pipe.
Remove the positive crankcase ventilation hose.
Remove the air cleaner resonator.
Disconnect the throttle body electrical connectors.
Disconnect the electrical connectors.
Detach the vacuum hoses.
Press the retaining ring. (1)
Detach the vacuum hose. (2)
Disconnect the vacuum hose.
Detach the injector harness electrical connector from the intake manifold
support bracket.
Remove the intake manifold support bracket.
Detach the engine wiring harness bracket.
Detach the intake manifold support bracket.
NOTE:
Remove and discard the O-ring seal.
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Jeep Liberty Check Engine Light/Misfire Due to Intake Valve Locks/Valves. ...Misfire cyc 4 and random cyc misfires, changed coil packs and plugs... sounds as if rod ... Light came on again (misfire on cylinder 4) - switched coil from 4 to 2. Light ...
CarGurusMay 27, 2009 - #4 misfire new plugs and coil pack on #4 light came back on after 300 miles if ... How come it stopped misfiring for 2-3 months, and now is back? ... I have a 2005 Jeep Liberty 6 cylinder, engine light came on scaned the codes ...
If you replaced all the plug wires and coil, and it still runs rough, you may wantto make sure you check any electrical distribution boxes that may be under the hood. When I wash engine bays, I always cover the coil and alternator with bags as to not get them wet. Also it never hurts to spray some WD-40 on the wires/coil. It displaces the water (Water Displacement Formula 40) and arc less. You may also want to put some dielectric grease in the boots of the wires on each end to help seal them.
It could be something as simple as a vacuum line,but sounds fuel related. Possible pump.get a fuel pressure reading done and if pressure doesn't hold.....suspect fuel pump
posible coil pak is leaking current[ arcing] also turbos take a radically different spark plug than normal engine. poeple at part stores mix them up al the time
ROUGH IDLING CAN BE CAUSE BY MANY THINGS.I AM LOOKING AT LEAKING VACUUM HOSES OR INTAKE MANIFOLD GASKET LEAK.DIRTY FUEL INJECTORS AND WORN ENGINE VALVES WILL CAUSE ROUGH IDLING.ALSO LOW IDLE SPEED CAUSE ENGINE TO RUN ROUGH.
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