hey...i got a gsr in my hatch and it was running great up until recently when i started it up to warm it and it started revving on its own. it would idle from 1-3 rpm back and forth without stopping..and for the past 3 days when i go to start it, it does the same thing..i haven't driven it for 3 days because even when i test drive it..the revving won't stop. can any tell me whats going on..and what could i do to fix it..thanks alot

 

how's the coolant level.....TPS sensor perhaps?

 

Look for (& fix) vacuum leaks.
Remove any air pockets from cooling system.
Clean out your IACV (& FITV if you have one)