UPDATE: I took my 2006 in to the dealership for an oil change and a few minor issues. Hood Open sensor failed....steering column plastic shroud was loose, some exterior bulbs and an oil change...and... the truck had been running rough at idle, difficult to keep it smooth, giving it the gas to keep RPMs up. After 2 hours, I was told it was a combination of the air filter and the cam sensor magnets on the left bank. Fairly reasonable and affordable repair. 2 more hours later, and they told me the truck , now..will not stay running at all...after they "fixed" the problems. I was told my intake manifold "cut loose" "finally went". 2000 bucks. No exact details as to what is wrong with the manifold, but the service adviser said it was probably cracked. So, since they told me it was DEFINITELY shot and no longer drive able, I had them replace it. Think I was "taken?" They have been very good to me in the past, and Ive had this nagging issue for a while. Was always under the impression it was the broken plastic bits on the manifold that's talked about often. What do you think, plausible? Im going to ask for my old manifold back.