It could be The MAF.

That's what tells the engine how much air flow is coming in. The ECU reads that data and also reads the data from the MAP sensor on the Intake, the cam and crank sensors, and The O2 sensors to adjust the fuel trim.

With out being able to see a Live data stream it just a guessing game. Unless there is a stored code comanding the check engine light on or code stored as pending but has not yet comanded the light on.

 

I believe there is whats called an IAC valve on the Throtle body. Not to familliar with the 06 though

IAC Valve= Idle Air Control Valve. This controls The Air Flow at Idle. If its sticking It would cause it to run rich. I cleaned mine and have not had a problem since

 

should it be cleaned or replaced?

 

try cleaning it. Worked on mine. I have an 00

 

should i just use the maf cleaner?

 

No pull it off and clean inside the throtle body and the sensor its self. It will have carbon build up on the sensor and in the air passage. You can use carb cleaner on it. When your done lube the shaft with something like WD40. Let it soak in for like 5 minutes and then re-install it.

 

ok thanks ill try that.

 

Found a basic video
http://www.youtube.com/watch?v=MnWiOrnVk28

I am not overly familiar with how the 06 electronic throtle body works, but the AIR passage on the left side when your standing at the front of the truck looking at the TB should be the passage for the Idle air control.

 

WELL..... I GOT HER FIXED!!!! I took it to my friend who owns DC Motorsports here in waco, and he checked the #7 injector and it was clogged like the fuel filter i replaced the other day! it had chunks in it! took about 10 mins to clean it out and now she's back to running like a champ! he said that the #7 & 8 injectors are bad about clogging up on the older 5.3s...