have you checked the multiplugs along the back of the engine bay, near where the interior fan draws air in, these can get corroded inside and cause all sorts of problems,,,
Do you mean were the relays are and so? at the engine bay itself I think I have tested every connection

also measured every sensor and tested loom and are ok. All sensor resistor values are within the limits also.
may be a silly one, but you do still have the carbon pip in the top of the dizzy cap don't you, they are famous for flying out when you remove the dizzy cap as they are spring loaded...
Yep it's there, on both dizzy caps: new and old
I'm just getting very worried about the white smoke it gets from the cone air filter. Don't know if it has to do with all the starting attempts I have made or so.
I had some minor problems in the past with several cars, but this one is getting me crazy. When I reach a point of don't have anything to do it realy irritates me.