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1999 Pontiac Grand Am Question: what causes an ignition coil housing to go bad & how do you check it?

 

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viking777, 2.4L 4 Cylinder, Middlesboro, KY, April 28, 2013, 13:14
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my car drives fine around town but at highway speeds or going up an incline it bogs or lunges and misses at traffic lights it has a slight miss when idling replace both coils and all 4 plug boots it ran good for a couple of days but now it seedms to be worse

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