Yesterday i went to pass a slow truck and when i hit 5000 rpms it just stopped going any further and felt like it was missing. Driving normal and accelerating up to 5000 rpms everything is normal. I tried one more time to see if it would happen again at a slower speed and it did it again. Seems to run totally fine besides wot. Trans shifts fine and i never had any harsh shifts from day one. I have had AFM turned off since it had 44 miles. I now have 26000 miles on truck. I did notice recently once in a blue moon it feels like i am running over rumble strips for a few seconds. Seems to happen when i am doing around 65 mph. Anyone have any similar problems? Also no check engine light. Thanks