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Re: 2000 JAG S-TYPE 3.0L MOTOR SOUNDS LIKE IT IS MISSING...
If you have oil in your plugs you need to really look at the rings and make sure that they are not broke or the rings are not stuck . Oil on the plugs is a bad sign. also make sure that the oil pressure is not really high. If the oil pressure is to high you can be forcing oil out into the spark plugs which will cause you to start fouling plugs and the engine running very hard
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Sounds like carbon fouling. Easy fix is run an aggressive fuel injector cleaner as recommended by your local parts store through the gas tank. Also ensure that spark plug wire is firmly attached. If you took the plug out-you know it is a pain to get to it! A easy way to see is to start motor and idle, pull #6 wire off at distributor when it should be attached to plug and see if the idle changes. If it doesn't, the wire is not plugged on the spark plug or the rotor/distributor may be faulty.
Another more difficult task may be the removal and replacement of the fuel injectors them selves (or cleaning by a specialty shop). Good Luck!
MISFIRE ON CYLINDER 6 COULD BE FAULTY SPARK PLUG OR BAD IGNITION COIL OVER THE SPARK PLUG,YOU COULD HAVE HAVE CLOGGED FUEL INJECTOR.CLEAN ALL FUEL INJECTORS USING A CAN OF SEAFOAM TO 3/4 TO FULL TANK OF GAS SEE IF NUMBER 6 MISFIRE CLEAR UP, IF NOT COIL OR FUEL INJECTOR COULD BE AT FAULT.ALSO CHANGE 6 SPARK PLUG FIRST.BEFORE BUYING NEW COIL OR FUEL INJECTOR THAT WAY YOU KNOW PLUG NOT THE PROBLEM.
TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.
YOU COULD HAVE A FAULTY FUEL INJECTORS.A DEFECTIVE CYLINER DUE TO BAD VALVES OR LIFTER STICKING OR INTAKE LEAK.MAKE SURE YOU PUT IN SPARK PLUGS ENGINE CALL FOR.IF YOU PUT IN WRONG SPARK PLUGS AND WRONG GAP.BAD WIRES ENGINE WILL MISS.
try unplugging the mass air flow sensor and driving it,it will throw a code for that when unplugged but it could have an "in range" failure which will not set a code while plugged in,hope this helps,also..has it been tuned up? what type of plugs were installed? was a complete tune up done? u could also try removing an O2 sensor and see if your problem gets any better..it could be a plugged catalytic converter,good luck