My buick park ave runs rough and cuts off while idling.It has new parts such as ignition coil pac,plugs and wires,all sensors,control module,fuel filter.Now im stuck cause i still dont know what the problem could be.
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if the other coils are functioning, then voltage to the coil pack is ok. removing the spark plug wire from the suspected bad coil with no change in engine performance is a reliable procedure to check for a bad coil.
I think you got your answer to the alarm issue. I had the same problem with rough idling, lack of power, and the chugging that occured when going up hill. I have a 1991 Park Avenue with 190k miles. Fixing the catalytic converter helped, but the real problem was in the ignition control module. It seems that older buicks will heat these units to the point that the glue inside melts and eventually exposes the electronics. Look for glue or exposed wires below the ignition coil. It's a $100 part that you should be able to change yourself. I hope that helps.