I spoke with diablew tune today and I'm going to have him do a custom tune on my truck. The problem is, the truck was tuned before I purchased it. I don't know what was used or what was even done in the tune. I'm taking it to the dealership next week to have it flashed back stock so he can do the custom tune. Here's the question, with a full afm delete, when it's tuned back to stock and the computer tells it to switch into 4cyl mode, is that going to cause problems with the engine internally?