Jack
What throttle are you using? Have you noticed any ice formation on the underside of the motor? I noticed the weirdest ice crystals on temperature drops from damp moisture in the storage air and it seemed to form on some contacts. Bit of dust, ice crystals, resistance ? Not that that is the problem but just another thought - I do not have heat in the Garage-in-a-box !
Lem makes sense - things like this never show up in the warm climates.
