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I have changed spark plugs, the boots, coil pack, 02 sensor, and furl injector. The service engine light keeps coming on when I hit 40mph and flashes. I am at a lose as to what it could be.

Vehicle: 01 pontiac grand am 2. 4 liter

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When you hit the gas pedal and faster, check the igntion boot the secondary igntion is still seeking ground ,

If the situation still persit you may just have to chenge the whole unit

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