Air filter thermostat is a non issue. Idle air control is a non issue. Cleaning throttle body, won't hurt. Cleaning PCV wouldn't hurt.
I would recreate the problem in my driveway, just drive 2 miles roundtrip. Then you have time to pull the plugs and check for over rich condition (wet). Check the resistance of the ECT sensor, with the thermostat open, the reading should be around 250 Oms. A high reading would indicate a bad ECT.
A vacuum leak around the intake manifold, anywhere past the MAF will cause a rich condition.
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Keeping it running is better than buying new
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