tyestick

Yea i tried the sea foam treatment before i do anything else to it, thank you though

So i recently bought a 1999 Subaru Forester with about 178k miles on it, the car runs good, i was able to get the car for a very reasonable price. The only thing i don't like about it is when I am at a red light or when i first start the car it runs really really crappy at idle. I looked it up and out of all the information i had read it seems like i have to clean or replace the IACV in the car. I don't want to start taking things apart and then not have a certain part or need to replace a gasket so i was just wondering if anyone has a step by step process i could use? or any tips that will help me fix this problem? Thank you much -tye