These TPS's shouldn't require any calibration, unless perhaps it's on the PCM side? While dealing with certain problems from my new TPS's (weird idle to WOT range from scanner, 10-69% and voltages from TPS don't match FSM specs) I spoke to a service tech at a dealership. He was puzzled by what I told him but suggested I come in and they use a DRB Scanner to reset my ECU. I asked him if this was similar to a battery pull and he said that they actually go in and delete information. For $94 I was not about to find out if this was actually true or not. Could this be the calibration everyone is speaking of? The FSM states that the PCM learns a voltage for the minimum TPS value and that the actions for several calculations (fuel management, WOT threshold, some fuel cuttoff values, etc) are based off of this learned idle voltage. If the PCM does need to be calibrated to relearn this idle TPS value then this is something we cannot do ourselves or without a DRB scanner which costs $8k. To the OP, did you try resetting your PCM like suggested? Did you try a 8-10 hour (overnight) clearing?