1999 Mercury Sable Rattling Noise when Slowing Down - Shoul

Lately my car has been making a rattling noise, and I think it has been smelling like burning something. It happens mostly when I'm slowing down and coming home. Also, sometimes at lights I think the car may stall. It hasn't happened yet, but it is jumpy while I'm stopped. And sometimes the car doesn't start easily.

I do know that something is wrong with the rear drums, the mechanic told me about 4 months ago and said I would need to replace them soon. Also, my gas line is cracked and the gas cap does not screw on properly so the check engine light is always on.

Inspection is due in a month and I'm figuring I'm going to need to sink a lot of money in it to get it to pass. I had been thinking of trying to sell the car, but I don't think I can due to the state lemon law. Should I sell it to a dealership for parts? Or should I just get it fixed to try to sell? The value is only about $3500 under best case scenario. Thanks for your help!