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

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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1 answer
check the resistance betwwen two terminals of the coil