I forgot to mention my car has a carburator.
I recently have change the airfilter in my endevours to try to fix this problem. The old filter was very dirty but unortunately the problem remains.
I checked the flow of fuel from the fuel pump, I estimate that it delivers something like 60 liters per hour from the hose just before the carburator (after fuel filters), but I havent changed the fuel filter.
I havent seen the "check engine light come on at any time".
I followed the instructions on your site (excellent site by the way) tried (and tried again) to find the cables for the ECU but no luck.
My car is right hand drive, there may be a different location for the cables!? I will give it another try again in daylight.
My next thing will be to check plugs ,wires and possibly the distributor.
Could this problem be caused by the carburator, there are a few things that can go wrong in there. I will hold off for a while before I take out the carb though.
I am not sure if my car has a pcv (pressure control valve??) as it has a carburated engine.
Thanks for the tips, any other ideas are also welcome.
I ' ll keep posting on my "progres"
thanks!