Imagine what it might feel like if the power wire to the ignition coil were dirty and not making a good connection. Imagine the voltage dropping off under load. I cant exactly say that it feels like a misfire. It feels like a weak spark condition in that it fires, but not with all of the "oomph" that it should. I have advanced the base timing to about 4*, which has helped a bit but has cut some of my take off power. It is a 5 speed manual gearbox.