twt, what tuner did you use?? I had a guy come in some time ago with a problem sounding like yours, and the tuner corrupted the computor bad software in the tuner and nothing could fix it but a new one. My 04 dropped a cylinder on my 6.0. It was from a corrupted tuner to. I would try taking .0020 off the cps and see if that fixs it. You may beable to get the computor reflashed and try that too. I know that some of the Bump to Bump stores and Parts Depot stores can have the computor flashed.