random stall at idle

[myws6formula]

Ive been fighting this off and on for some time and im looking for some help on this..

seems to happen noticeable once warm and will be slowing down to stop, push in the clutch rpm drops (i think just a little too quick) and over shoots the idle speed and will stumble a bit and stall or sometimes catch and come back up to the desired idle

ive tried adjusting the TC and TF with decay no help.

i have cleaned the IAC thinking it may be carbon causing it to randomly stick or be too slow with no change



the cam is not very big so I would think its something I'm just overlooking.

info below

[statesman]

Post your tune and a log.

[myws6formula]

i dont have a problem doing that but what PIDs do you more experienced suggest I use for the log to obtain the best view on whats going on?

RPM
TPS
Ignition Timing advance #1 cyl
IAT
ECT
Commanded A/F ratio
MAP
MAF grams second
guessing one of the O2 sensor mv (bank 1)
IAC position
Desired IAC position

[statesman]

Sae.tp
sae.rpm
sae.vss
sae.maf
sae.map
sae.iat
sae.ect
sae.sparkadv
gm.afr
gm.ibpw1
gm.iac
gm.iacdes_b
gm.iac_sum_dma

[myws6formula]

1700417005

here is the current tune and log with it acting up

[statesman]

Your spark and fuel look alright. Your desired airflow looks a bit low. Use your roadrunner to slowly bump up your Desired Airflow {B4307} while you drive around... see if commanding more idle airflow helps at all.

[myws6formula]

I will give that another shot.. I tried a little before but maybe it wasnt enough

LABELS Desired Airflow (Grams/Second)
ECT °C {link: SAE.ECT} In Gear Park/Neutral
-40 24.500000 0.000000
-28 22.786133 0.000000
-16 21.186523 0.000000
-4 19.741211 0.000000
8 18.295898 0.000000
20 16.455078 0.000000
32 15.008789 0.000000
44 13.563477 0.000000
56 12.248047 0.000000
68 11.099609 0.000000
80 10.484375 0.000000
92 10.000000 0.000000
104 9.619141 0.000000
116 9.356445 0.000000
128 9.093750 0.000000
140 8.936523 0.000000

[myws6formula]

I raised the desired airflow from the bottom up about part-way (from what I think this is the area the stall happens the most ) instantly could tell a difference just by bliping the throttle and watching the rpm come down to idle. I waited until it finally stopped raining long enough and i took the car out to test. it seems much better and didn't stall once. seemed like it had better control over the engine speed as it brought the rpm down to idle.

things I noticed were cold and coming to a stop idle seemed to hang just a tad too long at first but I think I can get that sorted out or even leave it as is since i barely noticed it.

the other thing i noticed was after the drive I was on the last stretch heading home and the car had a surging with light throttle while keeping a steady speed. I did a search and looks like possible might have too much air commanded at the load? or spark perhaps is not steady or smooth transition? I will have to run a log again and see what its doing.