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Zombiekiller 03-19-2013 08:45 PM

Spark plug problems?
So I may be having spark plugs if my gap is off is it possible that my jeep would run fine sometimes and then sputter and jerk other times randomly? Any help would be great

Jerry Bransford 03-21-2013 07:47 PM

Could be anything from worn spark plugs to a bad distributor cap, bad rotor, bad 02 sensor, or bad ignition wiring.

I'd probably start with new spark plugs, distributor cap, and rotor. Three good plugs include the Autolite AP985 or Champion 3034, both of which are platinum plugs good for 100K miles, or the Autolite XP985 which will perform well for 200K miles. Gap them to .035. Try to find a distributor cap & rotor with brass contacts, that is better quality & will last longer than cheaper versions with aluminum contacts.

And if you haven't changed your ignition wiring in recent memory, I'd check it over for cracking or other signs of aging indicating it could be breaking down and in need of replacement. For the ignition wiring set, there is so much junk out there that I only recommend the OE Mopar replacement ignition wiring set.

If none of that helps, I'd think about replacing the upstream 02 sensor.

Zombiekiller 03-21-2013 08:35 PM

I just had the spark plugs changed when the problem started happening and after that it was good for 2 weeks or so and then started messing up again... I'll look into the ignition wiring though. Could that cause the on and off malfunctioning?

Jerry Bransford 03-22-2013 02:10 PM

As described above in the first line of post #2, it could really be lots of things... including the ignition wiring.

Zombiekiller 03-22-2013 09:55 PM

Yeah I know a guy so I will look into it this weekend!

Tiburon 03-26-2013 01:31 PM

Throttle Position Sensor can also cause this issue.

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