Could you show me a picture of where the intake manifold runner control is located? so that I know what I am looking for.

First make sure the vacuum runner control motor has vacuum at the runner control vacuum control solenoid. Attach a vacuum pump to the runner control vacuum motor (located in upper intake manifold) and verify it open's and closes properly.

Do a Web search under the terms (Your make, model, year vehicle) intake manifold runner. Or intake runner control solenoids, rods, etc. You may find Youtube videos.

The runners are sandwiched under or inside the intake manifold. Some had plastic clips which crumbled and the operating rods became disconnected. Some runners stuck too bad for the rods to move them.

Without knowing what car you have it gets difficult to be specific, however since usually p2008 is dealing with intake manifold runner control, and you have a high idle...Id say you may possibly have a loose or broken vacuum hose to runner control...with the vacuum off the runners cant be regulated...and the air leaking in through the bad/open hose will raise idle. check vacuum hoses and runner linikage

It is attached to the intake manifold, it is a valve that adjusts the runner length of the intake for optimal performance and fuel economy.

07 focus ,which engine?
alldata.com its there.
login .

code p 2004 has two references
intake manifold air control actuator , bank 1 --actuator stuck open====causes ---wiring---intake manifold air control actuator ---mechanical fault
second reference is
intake manifold air control solenoid , bank 1 --solenoid stuck open===causes ---wiring--intake manifold air control solenoid ---mechanical fault
probably means the same as what you have but in a more easy to understand method
--2012

You have to use Google to find what you need

This is a social web site

Any one responding to your question would have to look
for it as you can,then figure out how to get it on this site

I am assuming you mean F150 truck.
The answer is maybe.
Code 305 and 306 are missfire codes for cylinders 5 and 6.
Code 1518 is for a problem with the intake manifold runner control which could cause the other two codes.

P1518 FORD Description The Intake Manifold Runner Control (IMRC) is monitored for failure during continuous or key ON engine OFF self-test.
Possible causes - Intake Manifold Runner Control (IMRC) harness is open or shorted
- Intake Manifold Runner Control (IMRC) circuit poor electrical connection
- Faulty Intake Manifold Runner Control (IMRC) actuator
- Faulty Engine Control Module (ECM)
Read more: http://engine-codes.com/p1518_ford.html#ixzz2KSN6Thui

I can tell you what it is and about where it is, but I have not worked on that engine before.

The intake runner should be between the intake manifold and the cylinder head. It is like a sliding shutter. You can sometimes clean them, but they can be replaced. Look online for photos by autoparts stores. This will explain things better if you see it.

Why they put them on cars? The operating range for intake manifolds is limited. Manifolds are shaped for performance or economy. With movable shutters inside the manifold you get a manifold that will do both jobs.

How are they activated? Most use Vacuum controls to move rods that move the vanes or shutters in the runner. In your case, the manifold runner activated and is stuck open. Now you can look at whether the control rod popped off or the activating Vacuum diaphram is jammed. But most use Vacuum power to open and flow to close them.

Your Maker is not alone in using these devices. Other makers have similar problems with their operation. Sometimes soot can build up and they fail to move.

I hope my solution is useful.