Occasional quick engine hesitation. No codes. Only visible clue is temp gauge bottoms out quickly then returns.I replaced fuel filter. Had sea foam put in gas tank a few times to possibly remove water. Problem still accuring. Only other unusual thing is my engine has stalled on me a few time as I was at a stop or quickly came to a stop. I'm thinking it's probably related to the hesitation problem. Brought vehicule to dealership. They pluged it in, did certain tests and found no codes and no answers as to my hesitation problem.