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I've successfully baselined the idle by cleaning the throttle body and by adjusting the throttle stop screw, throttle actuator rod and brand new TPS to Volvo's specifications.
The IAC has been thoroughly cleaned overnight and reinstalled. Once the carburetor and injector cleaner ran clear, I stopped. The vacuum hoses have been checked for cracks and clamps re-recorded. For good measure, the bolts that secure the throttle body gasket have been checked.
Although it may not be directly relevant, the air filter, spark plugs, wires, distributor cap and rotor, fuel pump and filter have been replaced. The ground straps have been checked to ensure they are secure. Electric connectors going to vital components and sensors have been cleaned with the appropriate chemical sprays.
Regardless, on cold start up, it vibrates but holds a correct idle of ~750 RPMs in park, neutral, drive or reverse. Not long after, and once warmed up, idle maintains itself at ~950-975 RPMs in drive or reverse, and ~1250 RPMs in park. If I apply a clamp to the IAC hose, the idle drops to ~500 RPMs, which seems correct.
At this point, I'm not sure what to do. I'm hoping for a clue to help me figure this out. If not, I either have to take it to my mechanic or simply sell it. At this point, I'm out of patience and willingness to invest more time with no results. Thank you for taking the time to read this.
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