Just bought a 1999 STS about weeks ago and I've been creeping the forums for a week or so, anywho I've got a few problems... First and most annoying is the fuel gauge, If the car is sitting for a few hours and I turn the key on it will tell me how much gas I have, but as soon as I start it up, it says I have a full tank no matter how much gas I have. I plan on trying the Chevron Techron, but I have a feeling it may not work. It's got a few other little problems that I'm figuring out on my own, like checking all the gounds and what-not. My other problem is that it keeps blowing the ECT fuse a few times a week. I just cleaned the ground to that fuse box, so I'm hoping that will solve the problem. My blower motor makes a TERRIBLE noise, like a air plane trying to take off. None of my heated seats work (front or back.) The back end is a little saggy, and I've never heard my air compressor kick in. When the car is cold and I start it up, it makes a god awful noise that sounds like it's coming out of one of the speakers on the dash? My radio doesn't like to save my equilizer settings either. I'm hoping these are all easy fixes.... (and the car has 150k miles) If you have any ideas as to what will fix/help them please LET ME KNOW!! Thanks for your help!