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Well, my neighbor stopped by with his Snap On scanner. Turns out it IS the IAS. It was reading -40F. And and after some searching online, this is a common reading when they go out. Unfortunately, it's built into the MAF. Now I gotta get one of those. Glad I work at a parts store; good discount!

did it cold.

ok, i do get some lean codes when this happens. so its kind of making sense. no problems with short trips. like i said, its just in the morning, when its cold overnight.

This morning 46 degrees; fired right up and maintained a smooth idle.

I have only checked fuel pressure while running, not overnight. I'll have to check that. Should there be any drop in pressure overnight? I have not checked the coolant temp sensor. How do I go about testing that? And yes, TB completely cleaned, inside and out. Thanks for the help!

Yes, I have checked that. No problems there. Thank you.

Hello everyone!! I'm somewhat new to this site and it looks like I need some help. Here's what I have: 2002 Tahoe 4.8L with 170,000 miles. Over the past few weeks I've noticed when it gets really cold at night (teens or 20's), and I go to start in the A.M., it cranks a while before starting...

Yeah, just installed new Walker converters on my '02. Very easy. Well worth the $300. And with 170,000 miles, it needed it!