I have a 07 cobalt ss with the gm stage 2 kit and the engine was a weriod studer, fuel cut out, or timing issue. It feels like the car studers and doesn't really want to go anywhere, and it only happens between 4500 and 5500 rmps and as soon as it gets past that, the car just wants to take off again. I'm trying to figure out whats causing thing and how to fix it. If any one has any ideas, the help would be apprecated!!