registered a while ago but am new here and new to tuning.

[crazy4chevs]

Hey all.. First and foremost, a big thank you to everyone involved, what a great gearhead community.

I'm working with a 2000 Yukon xl 5.3l 4x4 engine and 4896 pcm. I have used pcm hammer (what an awesome tool) worked perfect with my autel maxi flash elite.

From what I get, the OS that I have doesn't have support and I need to reflash the OS as well as the calibration. From reading, I believe I need the 12212156 or the 12208322.

I have tried to used the OS and xdf in post # 2 here
http://www.gearhead-efi.com/Fuel-Inj...ed-is-TunerPro)

but am having problems. It keeps coming up as php file. Sorry for the questions on the first post...any help in the right direction would be much appreciated..

[crazy4chevs]

I think I figured it out.. I re saved the xdf file and went into downloads and renamed it from .php to .xdf now it seems to load..