Thanks so far for all the input, I am currently following two leads: 2.1.
Zoltan recommended to clean the distributor cap, Ken questioned my AFM. The
distributor cap I just cleaned, but the arm looks kind of fried to my
untrained eyes (see pic in the link) in the other picture you can see that
the upper right contact in the cap misses the little insulation bit on
top... I guess I should exchange arm and cap? Tonight will fix the afm.

http://outdoorinsider.blogspot.com/

thanks, flo