Engine misfire - 450SLC
 

We have a problem with engine misfire the first problem was that every time that we start the engine we had a different cylinder misfire .
We replace the injector distributer since that we solve the problem
But now the engine still fill like misfire but when I put it on the snap on monitor its showing all cylinder ok .
The question is what next?
Check timing ?
Check injectors ? ( look like someone replace it before )
I will appreciate any idea and help to solve the problem