318 engine. replaced plugs, wires, dist.cap, rotor button, head gaskets, has 150lbs compression on all cylinders, checked all fuel injectors and they are spraying. one mechanic says cam may be bad.
Check the spark plug wiring . There are several places where the wires cross each other. These wire cross points MUST be at right angles to each other. Or you will have a misfiring problem.
Strip heads off again and remove the valves and check the seats ,regrind the valves and fit new springs and seals ,also check the cam lobes for deformation (wear)
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