problems with my 2000 elantra

Hi, Recently my car started misfiring,so I replaced sparkplugs and wires. Then, it started losing power. It would start up and go but would lose all power, within 100 hundred yards of driving. So I replaced the coil pack. No change, except,the check engine light went out. So I replaced the fuel filter, no change again. Whats next? Oxygen sensor, maf sensor or fuel pump? Help

The problem is it's a hyundai. Those cars have so many problems I couldn't even tell you where to start, except maybe buy an American made car. Also, you're in the Chevy C/K forum, you may want to see what other hundai drivers have had go wrong.