THis should have posted in the "stock" forum, but I would bleed the coolant. On the thermostat housing, there is a (iirc) 12mm nut at the base of a nipple. Loosen that nut while the car is running. This will allow the air bubbles to escape.
I'll answer this one then move it to the appropriate forum.
Ahem:You need to bleed your cooling system.You still have air pockets in your cooling system.
The CTS(coolant temp sensor) is the ECU's way of knowing cooling temperature.It needs this info to help optimize idle and fuel mixture.Whats probably happening is as the warm coolant passes the sensor its getting fluctuating readings because the "cold" air bubbles are also passing by.
The ECU is changing the idle due to the changes in readings from the CTS.
I know run-on sentence,but thats how it came out.sue me! :lol:
Fix:Bleed your cooling system. :idea:
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