Originally Posted by alaxfire

Since you say "the engine turns over", then that is not the RCM, it is a CPS type issue.
And since you have repeatedly replaced the CPS, that then leaves the CPS harness / connector or possibly a Camshaft Position Sensor ( front right of the engine ).
It could also be an intermittent fuel pump or clogged fuel filter.

If you can catch it in the state were it turns over but does not start, have someone do the ignition while you have a disconnected spark plug wire connected to a spare spark plug and laying on the engine block. See if the plug fires.
If it fires, then fuel issues, if not then electronic spark issues.