I have a 1992 400se. Last winter,cold starts would givve me a rush to 3000rpm's then back to 400rpm's then stall. This was the case until heat was achieved. Then it would start and run fine. Now when I start, it runs up to 4000rpm's and back to 400 rpm's and stalls. Sometimes upon restart, the ASR light will come on and it will idle fine but only 2/3 throttle. If you run the car like this, and do an ignition off/on, the ASR light goes out and the car will accelerate to 60mph by itself. Trickey getting it out of the garage when it does this. I try to get it in gear on the dropside of the rpm's but it wants to go by itself..good 10ft burn out marks on the floor!!!..what could be causing this?