2000 Kia Sportage

Engine Performance problem
2000 Kia Sportage 4 cyl Four Wheel Drive Automatic

I checked the plugs and the third plug was really fouled out. I mean really black. I changed the plugs and swithed the coil packs around to see if it was a coil pack issue. I still came up with the third plug as a misfire. I don't have a fuel pressure tester so I took off the fuel filter and blew through it and no restriction. The car jumps at slow speeds, but at high speeds it doesn't. I even tested the plug wires, purge solenoid, canister clossed valve, tps, maf sensor, and iac.
September 12, 2008.

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