some notes: i suggest disabling idle fuel("idle fuel") entirely.... i'm sure Chris has also dealt with it before, but GM included some rather odd alternate fueling methods in most/all of the MPFI 60V6 masks. one of them is the ability to calculate fuel requirements at idle via a weird hybrid alpha-n/speed-density algorithm that is VERY reliant upon IAC operation being nothing short of perfect and the calibration tables that use its calculated position to be very accurate. i removed this code entirely for nAst1 since it has never given me anything other than trouble. it's a single flag to disable it at idle, it forces speed-density mode at idle instead.
Calculate BPW at Idle as a Function of Airflow (X=Yes)
there are also some scalars involved that will allow that hybrid mode to be used in non-idle situations as well, such as coasting down from speed with no throttle. another removal from nAst1, this one is a little more involved to disable it.
set to maximum values:
MPH Above Which can become Idle Fuel (KIDFMPHH)
MAP Above Which can become Idle Fuel (KIDFMAPH)
MPH Below Which can become Speed-Density (KIDFMPHL)
MAP Below Which can become Speed-Density (KIDFMAPL)
set to minimum values:
RPM Below Which can become Idle Fuel (KIDFRPML)
TPS Below Which can become Idle Fuel (KIDFTPSL)
MAP Below Which can become Idle Fuel (KIDFMPL)
RPM Above Which can become Speed-Density (KIDFRPMH)
TPS Above Which can become Speed-Density (KIDFTPSH)
MAP Above Which can become Speed-Density (KIDFMPH)
GM actually completely disabled this in certain calibrations already, but not all of them.... ?
also, i included two sets of VE tables..... one with base accounted for, one without. not sure which you would find more useful?
http://www.gearhead-efi.com/Fuel-Inj...ll=1#post36989