CAM timing

Hi I have replaced head was told the head was skimmed, vacumed tested. My mechanic friend put it on for me. We did cam timing which I think was wrong. Car was fireing like trying to start. Downloaded the manual(service manual musso)from internet followed instructions and corrected cam timing all looks right. Compression was at around 130psi on cyl1 before I redid cam timing now timing looks right as per manual now have around 30psi in 1, 2 and 3 cylinders. Can you help me?