well besides changing the wires, plugs, coil etc the only things that seemed to work for other Dsm owner was: loose wire on front of O2 sensor, disconecting and reconnecting map sensor,ECt sensor, as well as a green and black wired disconnected underneath battery in the main wiring harness. I dont have time to do all these things soon though can anyone else help? Im thinking its my Cat just dont want to spend a fortune, I already spent 4K.