• Tiny
  • gary_waldrop
  • 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.

Do you
have the same problem?
Monday, July 3rd, 2006 AT 6:23 PM

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