I have a 1989 Eagle Summit with 45000 miles on it that was owned by my mother-in-law and she only occasionally drove it short distances. It had old gas in it that had largely turned to varnish and we had the entire fuel system cleaned out. The engine runs like a top and has plenty of zip when driving, also it starts immediately after sitting out all night in 5 degree weather, runs up to fast idle as it should during warmup. Once warm though, when the car is not in gear, it will stall almost immediately. It's fine as long as it's in gear, no problems while actually driving it, but as soon as we park it and take it out of gear, off it goes. It will restart immediately if we need it to but I would certainly like to solve the problem. Hope it's not the ECU or something like that.