Recently my check engine light came on for PO507 Idle control system rpm high. I replaced the Idle air control but problem
still comes back. I have a PO2098 Post Catalyst system fuel bank 2 fuel trim lean.

What do I need to replace to fix these codes?

Any advice would be greatly appreciated.
thanks in advance
Troy

 

Is it a 4.7, the 3.7 might be similar.

On the P0507, are you actually idling fast? On the back of the intake manifold there is an elbow - check it for leaks/cracks. Any vacuum leak will make you idle high.

That might also be related to the P2068 - don't see that much. It can be caused by an 02 sensor problem, bad PCM, an exhaust leak, or a problem with the fuel injection system.

 

I think it might be a intake leak. I already replaced exhaust gaskets. When i spray carb cleaner around sides of intake engine stumbles.
I bought victor reinz gaskets for intake and throttlebody
I also got new fuel injector filters.
When i take off plenum do i have to remove alternator. I know fuel rai has to come off.

 

4.7 liter engine 2004 4x4

 

It does appear you have an intake leak.

You shouldn't have to remove the alternator but it give you a bit more access. You will have to remove the harness though.