Just incase some of you haven't seen yet. I got this from my buddy who works at SVT:
SM 17542 2003 MUSTANG COBRA - LACK OF POWER ON DECELERATION
SOME 2003 MUSTANG COBRA VEHICLES MAY EXHIBIT DRIVABILITY CONCERNS INCLUDING LOSS OF POWER ON DECEL. THIS MAY BE CAUSED BY THE CALIBRATION OF THE POWERTRAIN CONTROL MODULE (PCM). TO SERVICE, REPROGRAM THE PCM WITH THE LATEST CALIBRATION AVAILABLE USING WDS RELEASE B29.3 OR HIGHER. CALIBRATION FILES ARE ALSO AVAILABLE AT www.MOTORCRAFT.COM.
--Matt
SM 17542 2003 MUSTANG COBRA - LACK OF POWER ON DECELERATION
SOME 2003 MUSTANG COBRA VEHICLES MAY EXHIBIT DRIVABILITY CONCERNS INCLUDING LOSS OF POWER ON DECEL. THIS MAY BE CAUSED BY THE CALIBRATION OF THE POWERTRAIN CONTROL MODULE (PCM). TO SERVICE, REPROGRAM THE PCM WITH THE LATEST CALIBRATION AVAILABLE USING WDS RELEASE B29.3 OR HIGHER. CALIBRATION FILES ARE ALSO AVAILABLE AT www.MOTORCRAFT.COM.
--Matt