98 stratus only firing 2 cylinders

help daughters car is in shop 98 stratus 4 cyl, only firing on 2 cyl. they have changed cam sensor, plugs, frogged wires, crank postion sensor,and coil pack still ony fires on 2 could asd relay be bad or the powertrain control module not be grounding the primary circuit properly not sure what code its throwin besides cylnders not firing? any ideas