I was driving approx. 65 mph, towing a small trailer with a motorcycle on it, when there was a big hesitation. It felt like the accelerator pedal was released and then jammed back on, even though physically the pedal did not move. It was over so fast that I did not notice any difference in any gauges, and no check lights came on. I made it another 100 miles to home uneventfully. I scanned and did not have any codes or pending codes. Obviously, intermittent things are difficult to find and very disconcerting to think about a pending failure, so I would like to track it down... if possible. It is an 05 6spd, 4wd, with Banks six-gun tuner, and Banks exhaust. It has 104000 miles and has been serviced per recommended intervals.