Hi All
I have had a problem with my Da-100.

Last two times I have flown the plane, the tempature has been cold, between 35 and 50 degrees. The engine starts on two cylinders, but drops to one. The first day flying I swapped plugs from left to right and it ran good.
Today it started on both but dropped to one cylinder. I reversed plugs and the same cylinder would not fire. Should I just put fresh plugs in see if that fixes it or does it sound like a bad ignition?

Thanks

Bill