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Toyota Corolla

1991 toyota corolla mileage 110,000. If I start the car up with all 4 spark plugs hooked up it will knock when it gets to about 3,000 rpms. If I unhook the first 2 spark plugs It will not knock any more. The first 2 spark plugs is not firing because it has a rough idle and the engine does not change when I unhook the first 2 sprak plugs.
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Gary_waldrop
July 3, 2006.




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