If you want to get a more accurate base idle adjustment then you need to disconnect the stepper motor and plug the idle air bypass. I did a write-up here: http://www.defendersource.com/forum/...8&postcount=30
Also, Hans has good advice about the fuel & ECU relays: Just replace them if you don't know how old they are. I think they get corroded over time. They're in the passenger footwell, next to the ECU. The two relays are the same.