How much does it cost to get an idle fixed in a 2003 Honda on 2003 Honda Accord

Someone is selling a 2003 Honda on Craiglist and say the paint clear coat has started to peel and the idle is off. I'd like to know how much it costs to fix an idle. Thanks.

2 answers
get a pre purchase insp on vehicle to determine issues. it willl be the best 100.00 you ever spent
What is the idle is off? Is this the engine operation while idling?