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coolant temp sensor and intake air temp sensor would be the next to check.intake air temp sensor is in the air intake tunnel between TB air air box. when running is there a DTC? by disconnecting the coolant temp sensor you put the ecm values at default try that if it corrects your issue replace it.(it will turn your check engine light on but you can clear later by disconnecting battery)
A temp sensor out of range giving a false cold reading can cause high idle . A MAP sensor can also cause high idle by advancing the timing resulting in higher idle .
This is normally the way it is suppose to work. You need to have the RPM measured for High RPM and duration. What you are describing is how an electronic choke is suppose to work.
The errors would be how high the RPM goes and for how long it lasts. When cold the RPM, fuel mix and timing are changed to give a rich fuel mix. As the O2 sensors warm(Could be defective) they signal the engine to lean up. The water thermostat also has something to do changing the engine to a lean running slow condition.
If obtaining heat from your heater seems to take Forever, the thermostat could be weak. This would coincide with the engine continuing at a high RPM longer because it is not warming up.
Quite possibly a vacumme leak. check all around intake manifold for vac hoses disconnected and /or cracks where they connect either to manifold or trace to end location and chec there also
are you sure it is a miss or a vibration? Focuses are famous for a vibration at idle because of the upper motor mounts. some get so bad that the whole dash vibrates at stop lights.
Check the cheap plastic vacuum reserve tank; if this is cracked (or any hoses attached to it) you are drawing in air that spoils the fuel-air ratio and this will produce a lean burn.
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