This motor usually runs great it has 160 psi in both cylinders. But lately Cyl #1 has not been firing all the time. I have tried switching the coils with no luck. I know it must be the stator or CDI but not sure which is going bad cause whenever I test each the cylinder starts firing again. Last Sat went fishing and it would not run right for the first half hour then for no apparent reason it runs normal again. And fires both cylinders. Which is more likely to have a problem like this? Working sometimes but not always. CDI or Stator