My mods are K&N typhoon intake i have had it 3 years never had a problem Invidia TBE. Cobb accessport stage 2 map have had it since August of last year everything was fine until a week ago. I was driving and i gunned it and it seemed to bog down at 5k. I checked the accessport and the codes were Tumble generator valve stuck open, Cylinder 2 misfire, Cylinder 3 misfire, Cylinder 4 misfire. The car runs completely fine until you want to give it a good bit of gas. I changed the plugs and coils. The wires seemed fine to me i wouldn't think that 3 cylinders would misfire. So i am lost. If anyone has any ideas it would greatly be appreciated. No smoke from the engine or any kind of smoke runs great until you really give it gas. It could be an injector i am still running stock injectors.