Problem?

[Hib Halverson]

Given the engine's calibration at idle, low speed and "tip in" is correct for the cam profiles you have and that the ignition system is in good condition...

First thing I'd do is make sure the IAC and its seat in the TB are clean and that the IAC is working properly.

Next thing I'd do is inspect the TB. If it's dirt inside, remove and clean it.

If the cal is not right, I'd still look at the IAC and the TB but after that, I'd have someone who knows calibration redo the idle and part throttle cal...someone like Marc