Ok so I still have no check engine codes since the ecu connection. I am still getting a stumble at throttle. I checked the fuel pressure at the rail and am getting 55 to 52 psi constant when idle and at open throttle and rev. So it seems fuel pressure is not an issue. I removed the throttle body, cleaned it and lubricated it, also put a new gasket and used gasket sealant on the o-ring and 2 maf sensor seals. Still same issue. I am beginning to think i have a bad MAF sensor possibly, unless anyone else has any other ideas?