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Spark Plug Recommendations
#46
#48
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Join Date: Aug 2011
Location: Prescott, Az
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
#49
#50
Senior Member
I would recommend doing a complete tune-up since you probably don't know when the plugs,wires, rotor or cap were last changed. It helps to keep detailed records. Go with the champion plugs. If you get new plug wires, save a couple of the old ones. Start the news plugs by hand using one of the old plug wires attached to it.
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