We installed these coil packs on our 2001 Pathfinder and changed the spark plugs in the process. The SUV has 150,000 miles on it and a spark plug change is probably long overdue. We have experienced engine vibration and check engine lights which we have diagnosed as an ignition and/or spark plug issue. To be honest we haven't tried coil packs alone, but if you're having trouble changing them and you haven't changed your spark plugs recently, it makes sense to install new spark plugs while you're there. We took the Pathfinder on a 4 hour ride right after changing the coil packs and the motor ran noticeably smoother, just like it did back then. was new. No more vibrations from the engine and no more check engine light. At the moment only positive results can be reported - about 5 or 6 weeks after the installation date. I would buy them again.
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