The search is down so please someone help. I have an APR chip , ATP downpipe and cat. I thought that the stock DV was the problem so i replaced it with a HKS BOV from ECS. The stumbling was still present. So ECS unpluged the MAF to see if that was the problem..... Nope that didn't work. So i am stuck with a sweet sounding car that runs like poop. To create the stumbling problem the car can be in any gear and all i have to do is apply more than 2/3 throttle input. I tried to see if the car would pull through the stumbling and it caused the check engine light to flash. What else could be the problem ?? ECU, Wastegate, N75 valve, fowled plug, or coil pack ?????