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Hi, my name is Jay
Once you have fixed all the vacuum leaks and replaced the idle control valve you should disconnect the battery and then relearn the idle.
To relearn idle you will first let engine idle in park with all accessories off for two minutes. Then turn on a/c with blower on medium and let idle two minutes. Then turn off a/c and put in drive for two minutes and while still in drive turn on a/c for two minutes. Road test vehicle accelerate to 45 and let coast until 25 mph. Do this twice and then bring to idle an stay in gear and let idle for two minutes to see if idle has stabilized? If still does not stabilize then you may need to drive normal driving for a couple days to see if it stabilizes? If still a problem then you will need to locate vacuum leak and scan for codes.
Warm engine before doing the relearn by idling longer until up to operating temperature.
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Here is pinpoint test for code P0507 that needs to be tested to isolate the vacuum leak or other problem. Pinch off brake booster hose to see if idles down?
Yes. When you are pressing on brake the IAC is at 10% and normal is about 12 to 15%. This still indicates a vacuum leak somewhere. Have you tried to pinch off the vacuum line to the brake booster to see if IAC % changes?
I rechecked the IAC % at hot idle should be closer to 32%. If you are getting 10% at idle then computer is trying to being the idle down. Does the throttle body have a throttle stop screw? What does TPS say at closed throttle?
TPS should be .8 at closed throttle.
You may need to lower it to .8 to see if it helps. If not then turn it back to up if it sticks. The lower throttle angle may fix your problem if you do not have any vacuum leaks.
Why is it showing you are in third gear? What is the rpms doing?
is it idling lower now?
Ok. Talk to you on Monday.