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Jeep Master
1,615 Answers
- Posted on Dec 05, 2013
Re: when does the spark plugs needs to be change
Usually you know when you need sparkplugs when it starts to miss. That is it runs smooth then kinda skips, runs smooth, then skips. Spark plugs will not cause your engine to cut off completly. Could be a coil problem or a fuel system problem. I would check fuel filter or fuel pump.
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