If you have a code scanner, just hook it up, activate it, and then start the engine. The Key On Engine Running test should run. One you receive the results of the KOER, tap the accelerator. This will initiate the test. The RPMs should increase to about 1800 for a few minutes. The computer will beep out the results of the test. A nine indicates that you passed. If it's less than 9, it's the number of a weak cylinder.
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