I have a 2003 Tiburon GT, 105,000 miles. Three days ago I took it to the shop and was told cylinder 3 was misfiring. We changed all 6 spark plugs and spark plug wires, but that hasn't fixed the problem.

What else could be wrong? Worst case scenario, am I looking at having to replace the engine?

 

Im new to this but I'm having the same problem. I changed plugs wires and coil pack. after deciding to change my injectors i seen inside my fuel rail clogged with what I'm guessing is oxidation cleaned it out stil the miss came back