Got back out to the airport for a 2nd flight of the day. Took it out to the run up area. Engine rough 1100-1350 rpm or so. Did the runup (I use 1500 rpm), and it ran rough on the left ignition. Took it back to the hangar. Pulled the cowling. Checked both ends of all plug wires (good use of the new quick-release cooling tins). Put the cowling back on. Ran it up again near the hangars, same result. I suspect a fouled plug from the previous flight, as I wasn't leaning, but I didn't think of that until on the way home. Next time I'll try leaning it on the runup and run it up a little higher rpm to clear it, and/or pull the plugs on the left ignition and see if there's a fouled one.
