After a long stayaway covid during wich I had the time to tackle some long due jobs I now have a similar issue with my Pi, and today spend more than a hour fine tuning the butterflies and still fouling, see picture attach!
Late february, car runs ok, allways with some fouling but accepted as a normal pi issue
Tackle jobs none related to engine or fuel system during lockdown
Starts at first turn after 3 months, but after short run plugs fouling (all similar oily)
Ok, renew points and condenser from Dr, change coil from sports coil to backup normal coil