MSPNP - RPM not dropping when shifting
 

Hoping there's something easy I'm missing here.

BP4W in na6 chassis. IAC thresholds were set after warmup. While street tuning, if I throw into neutral the RPMs stay put (and sometimes even move up slightly.) While driving I can also take my foot off the gas and rpms don't fall much, BUT if I blip the throttle by 500 - 700 RPMs the rpms will drop back to idle. Not sure if this is an IAC sticking (ie: mechanical) or related to the MSPNP. Looking for advice on where to look.

If my AFR table looks way out-of-whack, I'd appreciate a quick look at that as well. (Note: I'm running batch injection, hence the 13.3 AFR around idle.)

There is a settng that holds the IAC open on shifts to keep the revs from dropping too much. Check that and see what the MS is commanding the IAC to do on a shift, if it's zero then you have a mechanical issue.

Please post a log.