This engine is mounted in an Extra 260 by H9 and after approx. 30 minutes run time on the ground, when range checking with the engine running, I experienced severe radio interference twice. I took it home and it runs fine with no interference issues. Has anyone had intermintent ignition module problems with this engine? Also, when cold, I have to prime it directly to get it started. It does not want to prime with the choke. Any solutions before I send it back? Thanks.