I'm another homeowner with an Exmark Lazer, and I had the same problem that also turned out to be nothing more than bad coils. Lotsagrass, you acknowledged seeing BKTP's post about the coils but I don't think I saw your response saying "yes I checked that and it's definitely not the reason for the malfunctioning". Checking the coils is a pretty easy thing to do. All you need to do is take a resistance measurement. I didn't even have to remove the coils, just the spark-plug wires.