Hi !

You had the right answer Bastian !
I have had my V8 in garage now for half a year doing cambelt change and some other tings. Also found the vaccum leak in the hose between the camshaft covers and now the strange feeling of small interupt of power is gone.
Made an "new" hose of the existing moulded hose ends vulcanized to an new straight hose. Lets see how long this hose live.
Can also tell you all that it´s no problem changing cambelt without the special tools holding the camshafts , as long you mark the wheels positions and not loosen the belt wheels on camshafts. You need an tool to hold the multibeltwheel on crankshaft ( can bee homemade ) when loosening/fastening the big screew and it can bee good to have an tool ( can also bee homemade ) to bee able to rotate the camshafts by grabbing the holes in its weels when putting the new belt on.

Bengt