The MAF, will be coming off the throttle body a ways, (near the front left side of engine bay I think...)
Just go to auto zone or some auto parts store and get a can of that MAF cleaner, than follow the directions.
As for the TPS, that would just have to be replaced if it was faulty. They are 60 bucks on the internet.
As for the IACV, you will need to remove it from the throttle body, (Right below the manifold,) and carefully clean it. If it is covered in carbon it might of needed to be cleaned.
But the thing you need to rule out first is the throttle body, if it is dirty...231k miles does a lot to the throttle body
To clean the throttle body, remove the large vacuum tube that goes from the Throttle body TO the MAF, and look inside it. If you get a flashlight and look into the throttle body, turn the butterfly valves, or throttle plates, whatever they are called and see if there is any carbon build-up on them. If there is, simply, but carefully, wipe it off with a clean rag with some cleaner on it.
Search for DIY for all of the stuff I just mentioned here on SE.
Could an expert in the field join this dilemma?
