My Tiberon idles very roughly, but runs great on the road. I pulled the idle air solenoid today and cleaned it out,I made it run worse. do these go bad?

No mention of any diagnostic trouble codes so I would remove large rubber intake tube from air
filter box to throttle body. Only remove from throttle body end lay out of the way. You willneed a can of carburetor cleaner and an old tooothbrush (not a little wire brush). Look inside throttle body and you will see the throttle plate. Reach and pull on throttle cable to open throttle plate fully. When open coat throttle plate good with carburetor cleaner, take toothbrush and scrub carbon deposits from throttle plate paying special attention to both sides. Carbon build-up in and around where throttle position sensor comes through inside of throttle body and connects to throttle plate causes throttle plate not to close completely when accelerator pedal released at idle. This can allow too much air into intake causing rough idle and also can cause Idle Air Control Motor not to be activated due to throttle plate not closing far enough for TPS to recognize throttle cable has been released. The IAC picks up and maintains engine idle until accelerator is depressed and TPS resumes engine rpm control depending on accelerator pedal pressure.
It is also possible that IAC stepper motor is going bad. Normally if this occurs check engine light will illuminate with a diagnostic trouble code for IAC P0505, P0506, or P0510.
Sorry it is so lengthy but pretty simple procedure. Hope it helps.
***Note*** Some throttle bodies have a wax pellet in bottom side of chamber so careful not to let
carburetor cleaner puddle in bottom when sprayed.If cleaner is allowed to puddle and eat up the pellet you have to get another throttlebody. Pellet cannot be bought seperately. When you pull throttle cable you can stick a small rag down in there to catch excess cleaner.