Cold start question.

[12sec.5.3]

Your cranking ve and timing tables dont look right, they need some work.

Cranking VE is from a 2004 stock 6.0 truck.

[minytrker]

Cranking VE is from a 2004 stock 6.0 truck.

I just knew it didnt look right for a 5.3, I didnt spend alot of timing looking through your tune but those were the tables that jumped out as not looking right. Have you tried the 5.3 VE? I looked on my base tunes I use to fire up 6.0 swap trucks my cranking VE is alot closer to the 5.3 than the 6.0. I would also load in stock timing tables and see if that helps, you have to much timing down low.

[12sec.5.3]

Todd_370_L92_11-2-11_ futral.timing.tables.tunI changed my cranking VE to a stock 02 camaro and my base spark tables to some others I had and it still aint right. For some reason i think its fuel AND IAC related. it wont stay running unless i keep tapping the pedal.

[ScarabEpic22]

You're going to have to tune the idle and IAC, simply copying and pasting other cranking VE and idle VE tables from other engines might get you close, but it wont be perfect unless you spend the time to tune it. Check out the links joecar posted a few posts up, they're time consuming but with a unique combo like yours you're probably going to need to spend the time and dial it in.

[12sec.5.3]

It seems as though something is really off though and I can't put my hand on it. I'm not at the point of fine tuning the idle to perfect, I'm simply trying to get it to crank without me having to sit there and play with the pedal until it warms up some. Sometimes I think it could be a small intake manifold leak because it acts right after it warms up.