the coolant lines are for a wax pellet air valve. this helps the car idle faster when cold.
You say the idle control solenoid was cleaned. what you are saying sounds fairly normal to me.
could it be that since the idle solenoid has been cleaned it is working more efficently now.
Hence you may need to reset your cold idle speed.
Another is that the weather is starting to get colder in the mornings and the choke may be causing the car to idle faster cos its colder
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