I just recently purchased a 2004 gts! Verry happy with my dream car but some serious problems have arisen! 😢 When I first got it, there was absolutely no coolant. I've gotten that resolved, and have been keeping a close eye on it, there appears to be no leaks, so far... ALTHOUGH! I do smell a very PUNGENT maple syrup smell, an endication of anti freeze being burned. ðŸ˜but there's more!! The RPMs fluctuate all the time. It boggs down really low or just idles to almost 2000!! It also stalls when I'm not in gear. At first I thought it was a leaking exhaust manifold. But I checked that thourouly with carborator spray. No leaks to be found! I really hope it's not a leaking heater thingy. I heard those where a b*tch to replace. Any ideas! Please help a girl in trouble! 😵