I have a stock 02 WRX that has been acting odd periodically.
Every so often you can hear the belt slip/squeak, and above 4k RPM the RPM's fall by 1K and then it grabs and starts to climb again even though my foot doesn't come off the gas.
I have more of a mustang background and know next to nothing about the subaru. My first guess would be the clutch is beginning to let go and the belt just needs to be tightened, but I'm not real sure. Any help would be greatly appreciated.