My 2003.5 MSP started jerking two days ago. I had a forge blow off valve on it before, but it still jerk after i put the factory back on. My only mod on the engine is a cold air intake, and boost gauge and the joebmc, i have removed all the mods and now only cold air. Unplugged battary it still jerks. it nowhas no power at all. you can hear the turbo working but then the car jerks..i checked all the piping for leaks and have tighten all of them..no thing helps..does anyone know whats going on??please help..!!thanks!!