I have a 2004 terminator and I've been having some issues. When I drive the car approximately 80 miles and stop, once I get back on the highway and get to 6th gear about 2 miles down the road the car with start jumping and hesitating. It's left me stranded several times. I've had it hooked up to computers and no codes are shown. Seems once it sits for hours it runs fine. It only does it on distance drives. Any ideas anyone?