Last week it snowed and my car had been sitting for a few days and when I finnally started it, it drove for about 5 miles before the tachometer gave a reading. This happened again this week when it snowed a little and the car had been sitting for a day or 2. I've had this problem before, I've never really figured it out. Also sometimes I will be cruising and the engine will go a berserk, rpms will jump up and down repeatedly and the engine will cut on and off. Sometimes cuts off for good. I've changed ECU's 2 times in the last year and now I have a reman, the problem just keeps comming back. Whatever the problem is, it is killing my ECU's i believe. Also the car misfires/hesitates noticibly ONLY under 4000 RPMS, more noticible when the car is not yet warmed up. I think all of these problems are tied together somehow. This has been a nightmare, ANY INFO/HELP/SUGGESTIONS, are greatly appreciated.