Tried researching a few threads but couldn't find much that I could use. On several occasions my truck, which is running HD300 tune, has some issues. When I get on it from a stop (maybe 3/4 throttle) the truck starts to accelerate hard. When it hits 3rd or 4th (not sure which one) sometimes it will just stop accelerating and the power will die. I'm pretty sure it's not a defuel issue because the tuner will start beeping when that happens. I origianlly thought it was the traction control because the tires broke loose a little bit, but when I turned it off I still had the issues. I'm not sure if it's a motor or tranny issue. My truck is stock height, although I have a leveling kit I'm very close to installing.