1987 Mercury Grand Marquise mileage: 154,000. Within the past six months, the car has had a stalling problem and rough Idle. About a month ago, it stalled and would not start. I tired to jump it, wouldn't take a jump. I had it towed to the garage. They put a new battery in and did some adjusting to the Idle. It work for a few days and then it started stalling again, but not bad. It has gotten progressively worse over the month to the point it would stall over and over again before catching. Once moving it wouldn't stall, unless it was in park. I took it back to the garage. This time they put a new throttle sensor or something on that line. I picked it up today, drove it for five minutes seem to be driving well, stop at a store. When I got back in it wouldn't start. I jump it and it started up, then it shut off, no start. Could there be a short somewhere, or starter? We had a probable with one of the electric windows this past summer, couldn't get to come up. We moved the wire in the inside panel and the window went up. Could this be the problem?