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Wisconsin salt will do that. Once the undercoating is compromised, vehicles in the northern states with a lot of salt on the roads during winter, will accelerate rust. So, this is definetly possible. Here's a DIY procedure if you wish : http://www.ehow.com/how_4508569_replace-oil-pan-gasket-jeep.html
Catalytic converters do wear and start plugging up and restricting exhaust flow. Back pressure will build till you feel loss of power and rough running. O2 sensors will start tripping as well as PCV and EGR codes. 16 years is definetly a long time for a cat. converter.
Inside the fuel tank. Usually easier to remove truck bed to replace the fuel pump. You will want an assistant to help remove the bed after removing the eight carriage bolts. This may not be the reason it is not starting. Is the engine 'turning over' when you turn the key?
Agree with #1, probably loose heat shield.
Could be either the rear brakes or the wheel bearings in the hub assembly. Need to inspect both to find the cause.
Agree with#3 probable cause is worn ball joints or tie rod ends.
Remove the interior panel with a phillips head screwdriver. Disconnect the plastic tabs from the door and pull the panel off by pulling toward you. Roll the window up. Use a screwdriver to pry all plastic tabs off and put door panel off to the side. Remove wire harness from passenger mirror. Remove both bolts that fasten mirror to door. Mirror will now come off. Install new mirror with reverse procedure.
Here's the procedure. Not too bad to do if you have a hole cutting bit: http://www.ehow.com/how_6567699_change-control-arm-bushings.html
Agree with #1. Not repairable, need to install new assembly.