[MP81]

Well, if it happened 11 months after, it doesn't really sound like the CAI directly caused the issue - it would've thrown codes right away.

Have you checked that all the intake hose clamps are tight? I don't know if the gassers are as prone to it as the first-gen diesels, but we constantly deal with intake hose clamps loosening over time. Occasionally that will allow unmetered air into the engine, usually resulting in a one-time lean code.

 

[MP81]

I am reading places the lack of an HONEYCOMB AIR STRAIGHTENER that my old intake system has and my new one doesn't have... may be the key to the problem. I have tried most everything else other than a tune. Which I hear I should go for if ALL ELSE fails. The air isn't flowing over my MAF the way it should be cause of the lack of straightener. I will try to find one to fit the 2.5 inch pipe just before my MAF.

If that was the issue, it'd have been an issue 11 months ago.

You say it still is showing a code - what code is that?