is your truck stock? What all mods have you done to it?

 

everything's all stock cept for the heads and 10.5-6:1 compression.

 

dont really think you can have a worn manifold gasket since it has zero movement... so i doubt your seal is the issue

 

I don't think you need a the SS tune copied over, you just need to tune the truck... Like i mentioned eariler.. Do a search on tuning with Long term fuel trims if you don't have a wideband.

 

Justin suggested it was an air leak, that's why I focused on that.

 

Oh, in that case, go buy some intake gaskets, Justin knows his stuff... They are like $20...

 

It's also a easy fix, should't take more than a hour or 2... I'm sure you have spent way more time with tuning. If it dosen't fix it then its kinda a no harm no foul repair, and you can eliminate that part and focus elsewhere.

 

where for that price? gmpartsdirect is showing them for like $65?

 

wow i just checked oreilly autoparts and they are like 54, i could have swore i paid alot less that that....

 

The older orange gaskets on 99-2003 trucks tended to leak. GM changed the design and materials some, now they are green.