By just resetting the ECM voltage to the perhaps improper voltage doesn't give the full range of the throttle movement. You really should check the mechanical position first, then reset the ECM via the accepted procedure. I just think it's foolish to do otherwise. Remember who wrote the FSM, they don't exactly have the best recommendations in all cases. See the lift pump issues if you disagree, I have a FSM, but will trust experienced users (i. e. DTT) that can provide more field experience then the FSM writers.
I still stand behind mechanical adjust followed with ECM reset. Just resetting ECM will not truly solve your problem, IMO.