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Car runs rough at lights, runs well when on the road. Switched positions of #1 coil, coil fired in it's new position
If there is no spark from both terminals of the number one ignition coil on your 1996 Cadillac Seville and the affected coil works correctly in another position then chances are the ignition module is at fault.
Q&A > Cadillac > 2000 Cadillac Seville SLS