[scketch]

Sometimes my idle goes all wacky on me guys. I can start my car, sit there and it will idle at 1000RPM and fluxuate to almost 2000RPM's on and off....and sometimes it goes into what I call throwing a fit mode and instead of downshifting to a light I might just throw it in neutral, well it desides it wants to accelerate to almost 3500RPM's sometimes and wont stop until my car comes to a complete stop.... I'm thinking I just need to mess with my idle control but is that all? Has this happened to anyone else?

 

[iminhell]

Would sound like either a bad Throttle Position Sensor and/or the Idle Air Control Motor, TPS being my first guess.

Other options are vacuum leak or spark issues (yes spark issues can cause a high idle).
Vacuum, leak more than likely at the PCV Elbow or EVAP canister on the firewall.