Question about 2003 Pontiac Montana

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Rough idiling. Sputters but wont stall when put in drive. Computer said mis fire on 4. Changed coil and plug. Computer shows nothing now. Same problem.

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It could be a problem with the injector for that cylinder(dirt or electrical).how are the other plugs do they need to be replaced.

Posted on Apr 05, 2011

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Posted on Jan 02, 2017

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