HEAD GASKET

Toyota Corolla

Tiny

gary_waldrop

July, 3, 2006 AT 6:23 PM

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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