Steve you have to perform the ISCV reset when changing the primary TPS. This might help you understand why. During the reset you are going to have to verify the correct gap between the ilde roler and cam. Its like .05mm once you have this gap you then set the tps voltage so you have .6 volts at .50mm gap the gap is pictured below between the green pencil tip and the yeller fat fingered arrow.
This gap is adjuted when you first click iscv reset. What happens is the throttle stepper motor fully retracts and then you set or check to verify the right gap. If its right you set the tps voltage before clicking anything else. If its wrong you adjust the nut 7mm on the end of the stepper motor until your feeler gauge just slide thru the roller and cam. Once the gap is correct you then adjust the tps voltage to .6 volts.(+/- .02 volts) After the you click the ISCV RESET again and the stepper motor should move .12 volts in this case .72 ( +/- .05 volts). If everything is right you click again and the ecu starts its adaptation of the hard Constant volt points and throttle positions. After its done you then click reset adaptives turn ignition off for say 5 seconds then back on and fire her up for your twelve minute tune . Hope this helps a little.