you need a tune up. oil filter, air filter, spark plugs, spark plug wires, etc.
Bad news: the converter is shot and they are not cheap. Good news: they are covered by a 10 year warranty so you won't be paying for it!
There could be a leak that is seeping into the seating. Check the engine as well as the radiator to ensure there are no loose connections which could be affecting performance.
don't ever smell your car's exhaust.
because of the exhaust
The car exhaust smells like the rotten eggs as a result of the hydrogen sulphide. This usually happens, when the engine is not serviced for a long time.
It sounds like it is over fuelling. The auto choke may be stuck open? The ECU/AFM may be defective There may be a small leak in a fuel line.
probably an exhaust leak, at or near the exhaust manifold
Likely an exhaust leak
Sounds like you have a coolant leak.
Leak in exhaust system?
Head gasket
Maybe a blown head gasket