2001 Ford Excursion Stalling

Please Help. After a hard rain overnight, my truck would not stay on. I had to give it gas while still in park or it would cut off. Also I noticed white smoke from the exhaust while doing that. Eventually car stayed on. But now at when I come to a stop, the car will cut off when I put my.foot on the gas to take off. I also.noticed the overdrive button.will.start to blink. Once the car gets going a few miles, then it’s fine. Then this process starts all over again once the car is parked. Also the service engine soon light came on. Any suggestions. Thanks

You need to take your Excursion to a good independent mechanic. You have issues that need to be repaired in a professional manner.