My 2002 just had the same issue over the weekend. I drove it yesterday on a 150mi round trip over to a friends house. Check engine light came on, and it felt like it had a major misfire. I let it get down to about a half a tank of gas, and I poured in half a bottle of sea-foam in the gas. Drove it a little harder on my way over to a friend house to borrow his scan tool to pull the codes. When I pulled into his driveway the check engine light turned off. He looked at it, and said it still had a sight misfire. Plug wires, and plugs are still originals. Drove it home the rest of the way (about 5-6 miles), and the check engine light never came back on, and it felt like it was running better. I'm still going to do plugs and wires before my trip down to the cities for Christmas.
1999 Ford Ranger XLT ext. cab 4x4. Level 8 Tracker wheels. Nexen Roadian MT LT235/75R15. K&N air filter. Sony MEX-BT3000P Stereo. Rockford Fosgate Power T1682 6x8" speakers.
2002 Ford Ranger EDGE 2wd. Thrush welded muffler. Spectre air filter. STK Pro Rack. Curt Hitch.