i have a 1986 oldmobile cutlass supreme brougham that i got lil under a year ago and im tryin to fix it up so itll run great and look nice but i dont really know alot bout cars, its got a lil over 55,000 on it and its tan but the roof has rust and the sevice engine light is on but idk what to do, so if anyone on here can give me info on what i could do that would be e cheapest way to help me thated be great