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My first question to you would be is why? They hardly ever go bad.
If you're having hard start, or "starving for fuel" conditions I would first run out (down) the majority of fuel in the tank then replace the fuel filter; you run it towards empty so that if you have a tank of bad gas it can cause a motor to behave badly. One you change the filter, put some fresh fuel in. If that doesn't help you should look at the fuel pump; you should have around 42 to 45psi on the out feed side of the pump. Once you have gone through those steps, then start looking at the damper.
First you have to determine if its fuel or fire. To check for fuel spray a few seconds of quick start into the air intake. If it starts and then stops. its likely a problem with fuel. If it doesn't start its likely spark or battery problems. Does it turn over?
If your getting fuel which it sounds as though you are, check to see if your getting spark to the plugs. Sounds like an ignition system issue. Not sure about specifics on Hyundai but could be distributor cap, rotor, distributor, crank or cam shaft sensors.
The fuel pressure regulator located on the fuel rail that supplies the fuel injectors must be check for wetness it has a vacuum line going to it if it looks wet replace it if it checks out ok locate and check the purge canister it may be malfunctioning.
They are gas charged shocks, so if they aren't holding, they won't hold in the future. You will either have to "rig" it, or buy new/used units and replace them. It could be just one that is bad (and it is usually really random when they go out), but they only make them just strong enough to hold as a pair.