I bought a 2000 Mustang GT with 12,000 original miles. It came from a collections and we use it for crusing once a month or so. Recently I was driving it and after I shifted into second gear, the engine just quit. The motor cranked over fine, but it woul not start. I had to towed to my car service center. This was on a Saturday and when they came in on Monday ot started right up and ran. They used it for a little while and it finally shut off like it did for me. They check the fuel and replaced the fule filter and it started up and it did not die again for them. I toook it home and we drove a couple of time that week and it was fine. One day I took it for 30 mile drive and when I fire it back up and shifted into second, it just died again. Back on the AAA flatbed to the garage and it would only spin over and not start. They came in the next day and it started right up for them. When they went to move it, it died, I beleive when he shifted into 2nd in the parking. The pushed it in the garage and it started up.chat rooms online say that the theft system could be malfunctioning and cut the motor out an another says there is a crash shift that might be cutting it out. It does seem to happen when you shift the car (Standard). I do not know if this means anything, but if the car sits for a month the batter needs to be charged. Seems like somehting is drawing down the battery. I restore and own race cars and I am fine until it comes to fuel injection. The owner of the service garage has been a friend for years, we are partners in race cars and I trust him and his guys. Currently it is running and they can not get it ot die again. I did read that if it is the theft system, I reade to cycle the key alarm system and it should restart. That might makes sense sit it has been locked and unlocked several times when it dies. Help!