It is just what I have read in the Fast Ford december issue, that the crank position sensor has a great influence on the fuel injection. Or I didn't understand it completly..

And I was also told that when the phase sensor on the distributor is not in time it has got influence on the fuel injection..

As my cosworth is running very very lean I try to find all the possibilities that can cause it..

Thanks for your answer hope someone else will support it.