I'm in need of some trouble shooting, kind of a weird problem. When my RPM's are at about 3.5-4k and i drop a gear to take off it feel as if all my power is "bottle necking" and then when all the power is released i get a ASC service required light. I hear that the differentials have a lot of play/flex and might be the issue, or could be due to my timing being off. And when I go to pull a code no code is present even with the ASC service required light is on. only mods i currently have on is cat back exhaust, and a cold air intake. I also purchased a Cobb Access Port and loaded up one of the maps. If anyone has or had the similar problem any advice would be great.