My car is acting up also, went out to start it this morning and the theft light started flashing, usually it will only do it once or twice and stop but this morning I tried for 10 mins and the same result each time, needless to say I was late to work, (but thats beside the point). I have recently changed batteries to an Optima red top, and it has plently of juice...Does anyone why this happends? please tell me, its very annoying!