You are correct Ed that you most likely need to calibrate the throttle pot with the new ECU, I have been able to in the past to get a new ECU to work without calibrating. The ECU does not use the throttle pot during cranking or base idle. Initial start up RPM command from the ECU is 1000 RPM. The ECU should be commanding 1000 RPM during cranking even if the pot was completely out of whack. 1000 RPM equates to like 3.5 volts at the throttle body. The only exception is if the throttle pot was open. If you turn the key on after 45 seconds the MIL will flash a four code indicating an open throttle pot. Or go to the green wire at the ECU. You would see.7 volts with the accelerator pedal at rest, and around 3.9 with the accelerator pedal fully depressed.