Just got a 2001 GT with 35,000. It's a Roush and it has the side exit exhaust system. After arriving home I was just listening to it idle and it was making a very slight and almost unnoticible "hiccup" or "miss"...about every 10-15 seconds. Almost like a small "Burp" coming from the exhaust tip. Like I said, it is very slight. Is this something to worry about? Thanks in advance...I'm new here.