So you're saying you don't think the CPS is the problem, or just that disconnecting is not a good test? I'm running out of possibilities - it's got good compression, new engine actuator, new wiring harness, new plugs, new plug wires, new caps and rotors, new fuel pressure regulator, new motor mounts, new O2 sensor, new EGR valve, cleaned injectors - it's basically refurbished and yet it still idles rough, quite rough really. And there's no fault codes. Where to go next?