Recently, my Dixie Chopper had a loss of power. I checked for spark and have spark on both sides. I recently discovered a broken valve spring and changed it with one that I had from a previous machine. The machine is hard to start and choke does not always help. It will struggle to idle and just dies most of the time. When you try to rev it up, it will either shut off or rev up. When it does rev up, it sounds like it is just dragging along. I do not feel good power.