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i sound's like the problem might b your air/fuel mixture is not operatting properly or the timing belt or chain might have jumper/ stretched, also there might be water in the tank.

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โˆ™ 2004-11-08 09:04:36
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Q: Why does the Pontiac Gran Am stall when put in drive but keeps running roughly and backfires from the exhaust while in park?
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