[Dragonwind]

This sounds like the MAF. The time when I installed my EVO intake I failed to replace the hose that connects to tube with the Mass Airflow Sensor. Becuase of this the car didn't know what was going on, would idle rough, and not rev. The CEL could also have been related to the MAF.

Granted there could be other things going on, but what I would do first is get into the engine compartment and see if the hose clamps are broken thus causing the hose to come off. I had to replace mine as one was completely rusted through. They are cheap and you can also just get a couple large hose clamps from the hardware store in a pinch.

Best of luck!
Chris