[Hudsonvalley435]

So I let the clutch out it starts to grab properly and then it feels as if a 300 ball rolled backwards in my trunk and hit( which is the clunk ). But the clunk isnt loud at all, but does make a sound. Then the 1/2 throttle acceleration is very twitchy and jerky, but full throttle seems to have less twitchyness. Only seems apparent in 1st and 2nd gear after the engine has been fully warmed up. Yesterday it finally gave me a drivetrain malfunction and a few trouble codes for cylinder #3 misfiring. Its driving me nuts, any other 6MT owners experience this? Its a 435i xdrive w/ FBO + BM3 stage 2 with 54k.