He has a 1987 Grand Marquis with a 5.0. The problem is when he starts it cold it goes to the high idle. After the high idle comes down to a low idle and you put it in gear, when you give it gas to go it hesitates and dies. Then you start it again and it is all good. This only happens the first time you start it when the car is cold. It is fine after that. Any ideas to get him off my back? Thanks!