So i have a 1990 talon tsi and its been having this idle issue since i got it. Even when it gets to operating temp, it will still idle like its a cold start, or sometimes will randomly bounce between 1400-1000-1400-1000. A lot of the time it just idles high like its cold and wont drop down and surge unless i rev it up and let it idle down.
Heres a video of it (Sorry about the music, wasnt thinking when i took the video as i just pulled in my driveway from work and it was doing it)
http://s50.photobucket.com/user/SevereSarz/media/20130326_171653_zps42351586.mp4.html
What do you guys think? IAC motor? I was told it could be the coolant temp sensor... But any ideas where to start? I need to go measure the resistance on the IAC and see if its good or bad. Also theres no CELs.