Sure it could. TPS monitors the position of the TB butterflies. If the TPS thinks the blades are closed when they are actually open, that could be a problem. Replacement TPS p/n 6L2Z9B989A
397 on a MD is nice. Congrats!turns out everything was related to a corrupted tune (did need the tps replaced anyway). Got it dialed in and am ear to ear grinning with 397 rwhp on the mustang dyno, very happy indeed, wish I could get my dynochart posted. thanks for your help stl