Buick 3.8 High Idle

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#1
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MAKE: Buick
MODEL: Le Saber
YEAR: 202
MILES: 85000
ENGINE: 3.8
DESCRIBE ISSUE....fast Idle 1500-2300 rpm does it cold start A/C on or A/C off . Let it warm 3-4 minutes and key to off and restart and the condition goes to normal idle. Except in Ohio winter months then at high way speed condition of high idle comes back in cooler ambient temperatures.
 
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#2
start with a scan - even if the SES/CEL is off.
Scans are often free at many part stores, post all codes someone will advise.