Idle issues Please help

[lt170chevelle]

Cannot keep this motor idling for very long and just slowly creeps into a nasty surge. Have adjusted timing up and down, played with fueling and airflow,Adjusted for the bigger throttle body, and just cannot get it to idle for more than a few minutes. Will idle smooth and then slowly start getting into a nasty surge resulting in a stall. Ive done the idle config, and made all the the adjustments that i can think of. Ive not done too many of the DBW setups and this one has allot of aftermarket parts. Please look at scan and tune and tell me what is causing it.

06 6.0l
Returnless fuel system
NW102 DBW TB
Prc heads
240 Duration .610 Lift cam
Fast 102 LSxR Truck intake
SD Mafless tune no 02s
Full Hooker exhaust system

Have everything Turned off for Idle config scan purposes except for the idle under/over tables. Idled allot better with them set back on, but still isnt right even with them in the mix. Ive been messing with this tune for a few days now and could use a hand.

[schpenxel]

Moved to gen 3 section, it typically gets more views.

[5FDP]

The MAF dtc's need to be set on first error to make it fall into speed density.

Your intake air temps read -38 all the time, you need to wire in a new IAT sensor. That could cause problems if that is not fixed. Then I guess start tuning with your wideband with an AFR error to correct the VE table that will be pretty far off with the changes done to the motor???

It's what I would try to do anyway, perhaps more eyes will help.

[cobaltssoverbooster]

how did you set your Running Airflow table? I dont see any Idle trims in the scan channels of your log.

[schpenxel]

Fix the IAT sensor first.

[lt170chevelle]

The MAF dtc's need to be set on first error to make it fall into speed density.

Your intake air temps read -38 all the time, you need to wire in a new IAT sensor. That could cause problems if that is not fixed. Then I guess start tuning with your wideband with an AFR error to correct the VE table that will be pretty far off with the changes done to the motor???

It's what I would try to do anyway, perhaps more eyes will help.

I normally run just the po103 maf high code. Any benefit of running all three? Also it does set the code and into sd mode. I did mistakenly put it on second error. Just corrected it in the tune.
Now the iat sensor , i normally dont run and have adjusted all tables related to not affect anything as far as iat.
I do have the wideband readings close to13.5-14.0
But i havent looked at it with an afr error setting in the scanner.

[lt170chevelle]

how did you set your Running Airflow table? I dont see any Idle trims in the scan channels of your log.

The log attached wasnt the config file for the braf.
I use the russ k config whent logging that.
Im wanting to do a few more scans to hopefully find a change in raf but its been really close last two times i ran it.

[schpenxel]

SD fueling calculations are based around knowing the DENSITY (I.e. temperature) of the air. You can tune around this for one specific set of conditions, but with ambient temperature swings you will experience swings in fueling.

You really need to add an IAT.

[lt170chevelle]

I did put the truck in gear with same results.
Anybody think its related at all to the tps fluctuating 1-2% as it starts surging with the big throttle body?
Just trying to think of anything that is adjusting while its surging.
Shouldnt it stay still as rppm rise and lower with adaptive idle turned off?
I was questioning that possibility.may be irelevant though.

[lt170chevelle]

I will definitely keep that in mind , but it definitely isnt the issue im having at the moment. I have several setups running sd with no issues, but are all dbc setups with stock throttle bodies and intakes. I see a slight swing from winter to summer.