Yeah the cat is still on it. It is stock too. Damn this pisses me off because iam not legal on the road right now. I let it run 10 minutes at best. Shit if I had known I would have let it run longer. Last tune up was ALONG time ago. I know I lag but I just dont drive a lot. Ok so tune up is necessary. I run lowest grade fuel. So should I upgrade to premium fuel on next fill? Let it run through a tank and fill again? Should I replace plugs also? Let me know asap so I can get this done. Thanks for your help so far.