This is for a 98 Montana Transport. The tune was done by another tuning software, not HP Tuners (the other one mostly used by GM 3800 V6). I tried to fine tune the VE and MAF. According to the scan, everything is acceptable while driving. However, when the TPS reach 0%, LTFT jump up to around +20. This happen when idle or, when let off the gas while driving, ie braking. Once the throttle body open, the LTFT will return to normal.
There's not much available data from the scan, only basic stuff (still waiting HPT support team to map out my PCM file). I used Excel to sort out the MAF (kpa), RPM and LTFT to do the adjustment in VE table.
I attached the scan log, VE, MAF and Timing table. The MAF is almost stock. The VE and timing are the ones I played most the time. I know there's not too much info and I appreciate any suggestion.