[shorod]

Welcome to the forum! Does your 2003 Tiburon have Coil on Plug (CoP) or a coil pack? If CoP, try swapping the #3 coil for one of the coils on another cylinder and see if the misfire follows the coil or stays on the cylinder. If it follows the coil, then you probably have a bad coil. If it stays on #3, then closely inspect the fuel injector connection and wiring. If that looks good, confirm you have good compression on #3 cylinder.

-Rod