Remove the kick panel to expose the ECU, undo the screws holding the ECU to the chassis. Behind the ECU there is a screw/knob, with this you can run a rich/lean diagnositc check via your O2 sensor. I had similar miss firing problems with my car after doing the usuall coil packs, etc, etc only to find the O2 was stuff. If you can be bothered doing all of this first, simply dis-connect your O2 sensor and the ECU will default to a rich fuel map and see how the car runs.