mine does the same thing, when i turn on my AC full blast, my idle bogs a little, even stalled one time. but thats mostly when its cold. although i do have ~1800 watts running off my alt and battery from my audio system. do you happen to have an aftermarket stereo system? that sucks tons of power, and could be the case. someone correct me if im wrong, but coils have nothing to do with the interior lights dimming. they are part of the ignition system. if you had a bad coil or two, your car would run rough and constantly misfire. heres a good trick, let the car idle, then hold a piece of paper firmly across a tailpipe allowing a small space for exhaust to vent. if your car is misfiring, the paper will sputter back and forth and make a "whap whap whap" sound very quickly. you should be able to hear it. but i really dont think its a coil.joshheat25 said:I have a 2000 GT and when ever I hit the brakes, or roll down the windows, or turn up the music, anything that uses power dimms the inside lights and causes my engines idle to bog down. I was wondering if anyone else has had this problem! I think my battery is going bad or maybe coils?
we got coil on plug baby! 
bdcardinal said:
