I've searched the forums and can't find my exact problem, similar but not exact. I have the headlight flicker problem when the AC compressor kicks on BUT the engine also "stumbles" or sometimes will shut off (while driving at speed!) and come back on and the waring lights on the dash will come on also. I've read that a larger batter usually takes care of the head light flicker but I haven't found any information on the engine shutting off. BTW this also happens day or night. This is driving me crazy!