E38 cold start issue and part throttle surge.

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Still having issues.. Truck is a 2010 chevy silverado 6.0L LSA w/2.55 upper pulley, 219/223 .625/ .625 112+0 cam, IDX1050x inj, LS3 TB, 5" cold air intake with LS7 maf card, 1 7/8 LTs no cats, 3.08 gears.

Having cold start issues and ive also noticed when the Fans come on it has a really bad lean spike.
Also ive not been able to fix the cruise to part throttle surge during throttle tip in.

any help would be great.. about ready to pay someone to tune this thing..

2010 chevy silvardo with LSA 2.55 upper pulley. 135 deg start up 12-4-2022.hpl
2010 chevy silvardo with LSA 2.55 upper pulley. cold start start up 12-5-2022.hpl

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here is the tune file.. the other log i guess is to large to attach.
2010 chevy silverado LSA tune 12-5-2022.hpt

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here is a log of the truck after it has sat for 5 hours.
2010 chevy silverado with LSA 2.55 upper pulley start up after 5 hours of sitting 12-5-2022.hpl

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No one?

[HawkZ28]

What fuel are you running, and how cold is ambient for cold start? Big difference between an Alaska, Nebraska, and Texas cold start this time of year.

One thing that made a huge difference for mine was adjusting Fuel/Open Loop- Base/IVT Gains Gas. I can't recall who's advice I took on here, but I took the 75.2* column and multiplied it by 1.02. Then the next colder column by 1.04, next colder by 1.06, and so on until I was at 1.18 at -40*.

I did this at the same time as some virtual torque adjustments, but feel this made the biggest difference with starting as well as continuing to idle.

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Im running 93 and im in AL so ambient seldom gets lower then 30.. and thank you for the advice.