Idles real ruff has died a couple of time reads multiple misfires on 2002 Cadillac Seville STS

Have replaced all spark plugs, coil packs, even air flow censer also has new fuel pump, and water pump

by in Land O Lakes, FL on April 10, 2013
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1 answer
ANSWER by , April 11, 2013
Monitor with scanner (live data) to see what's causing the misfire.