Originally Posted by r0nd3L

Did you ever resolve this problem?

My recently purchased 300E runs excellent with one exception. It sometimes stalls right after starting or stumbles for few seconds until idle stabilizes.

I checked the duty cycle from X11 connector and here are the results:

Ignition On, Engine Off: 50%
Engine at Idle: 48%-54%
Engine at 2,500RPM: 68%-72%

What would cause it to be 50% and not 70% with engine not running?