I have an 02 Subaru WRX with the stock 2.0 motor that sounds like a valve is ticking. Kind of like a sound when you run low on oil. I just drove it across the country and got on it pretty hard a few times...I did an oil change when I got here and it was a quart low... It hit the rev limit a couple times too. The car runs good and idles great but is super annoying. I kind of feel like it's sluggish at low RPMs too or maybe I'm just paranoid because of the noise. Sometimes when I get on it hard it does like this fuel cutoff feeling and doesn't want to go anymore in fourth gear as it's revving up before redline or maybe that's just another problem. The ticking is RPM related so it gets faster if I rev it. I'm trying to figure out what the problem is and I'm taking it to the dealer monday to have it checked out but is there anything I could do prior to eliminate certain things that it could be? Any help or past experience with this problem would be helpful. Thanks.