It is possible to damage the throttle blade control motor by moving the throttle blade (usually happens when you leave the ignition on while moving blade). Neither of the tps sensors or the throttle control motor at available separately, you must purchase the whole throttle chamber assey, and there will be a core charge. Its not common, but not unheard of to damage it.
As previously stated, its most likely a incomplete iavl relearn, but without the proper tools (consult 2 or 3) there is no way to know.
2011 FRONTIER SV 4X4 6SPD CC/LB Knight Armour
Lifted, truetrac, injen, ims, bullydog, skids, HID projectors, WRP underdrive crank pulley, blah, blah blah