So sorry for the delayed response. This week was crazy busy.
Well this thing is called a bunch of different things including "intake valve", IMTV, ect.
My issue was the truck went into limp mode on the highway. I had it towed to the shop where they hooked up the OBD2 and said I needed a new IMRC. I was told this controls the variable Intake at different revs. The quote was $1500. It would not go over 10mph. After a week of sitting and disconnecting the battery, it worked and drove fine for 3 miles, then went limp again.
It turns out there are a couple things this can be:
1.Stuck intake valves- You have to remove the intake manifold and free them
2. Bad wiring to the variable IMRC (little black box)
3. The small 4", bent rod in the back of the IMRC has come loose due to old plastic bushings.
Mine is #3
. I bought some new bushings form Autozone in the "Help" section for $3. The problem is replacing them and getting the arms in the correct position to insert the rods. I still have not installed mine b/c I think I am going to try to take off the IMRC while blindly fiddling around back there. Then install the bushings and the rod on the IMRC. Then reinstall the IMRC on the back of the upper intake manifold.
If that doesn't work, I will do it the way the mechanics would and remove all items above the manifold. Remove the upper manifold. Install the bushings and rod. Replace the Intake gasket. Reinstall the upper intake manifold. install all the things above the manifold. :thumbdwn:
Good luck and I hope this at least helps a little