I have a 2002 F250 4x4 with the 7.3L diesel. Lately when I start it up with the engine cold if I don't warm the motor up for at least 10 minutes it will start to accelerate somewhat sluggish and then come to idle no matter how much throttle I give it and sometimes it just dies as well. Has anyone had this problem with their truck? If so what did you find caused the problem?