I had my alarm put in a while ago, since the time I drove from the install place my car has been shaking everytime I'm at the red light or parked and the car is running (never shakes when driving only when standing)-when I first stop,after about 5 seconds my idle will drop to 500 rmps, car will shake, and go back up again. I had battery backup put in also. Day after the installation my check engine ligth came on with 0701 multiple cylinder misfire. Is this coisidance or could the alarm be doing something with the electricity,maybe it's throtle positioning sensor??. PLEASE HELP!

What kind of alarm is it? Was remote start also included? The battery back up should have zero effect being that it is most commonly a 9volt battery connected directly to the alarm brain.

It was RX-2 "Clifford" Alarm. They also put in 2 extra sirens and the proximity sensor.