I have just recently purchased my first Saab. it is a 91 900S with 120,000 miles. I picked it up for $550 and had to replace the windshied(200) and front tires(180) and tune up parts(~45) it is running great and it drives great. but when you start it up it sounds kinnda funny in that there is a slight rattling sound. I checked the timing belt tensioner and it is at about 9MM any ideas on what I shoud be concened about if anything??