Hello,

I had this, finally traced it to ignition leads.

If you havn't done this recently, do a tune up, Ign leads plugs and rotor/distributer cap etc. Make sure, very important, you get the non resistive plugs they are hard to find now. Don't let the shops tell you they have a replacement, they don't?
Good quality ign leads as well?

Good luck

Gavinbr
300ce/m103