[DunesRunner08]

If anyone can help please...I tried to start a thread, but i couldn't, so here I go with this question.

2006 F250 w 6.0L in it. Mods for power are intake exhaust and programmer. I've had no issues till the past couple days. I am getting a big vibration when the engine is working up to speed. None when I'm in neutral, and it comes and goes, mainly when under load or when i let off the gas and hit it again so its reving up to catch up to get the load (if you get what I'm saying). I have no Idea what the problem is. I tried to return the program to stock and that didn't change it. Has anyone else had this? Can someone help me out?