98 Buick Regal GS Code P0303 Misfire HELP! - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-17-2011, 06:55 PM   #21
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I guess I can't edit my prior post. DH said he DID replace the ICM. So, all has been done above. Any other suggestions?
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Old 09-17-2011, 09:53 PM   #22
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From time to time a bad ICM can cause a misfire on one cylinder.
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Old 09-20-2011, 08:09 AM   #23
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maybe the crank sensor is going out. just a thought.
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