...because you alternate between thinking you've fixed and not! This is getting very silly indeed, I though maybe I had a dodgy alternator so I started checking that out today, Oh hang on, let's get back to the beginning The symptoms are that there is a persistent misfire, it's not on a specific cylinder but it's more like she's not fully firing all the time. It's through out the rev range and doesn't seem to respond to any fuel or ignition settings (choke in/out, advanced/retarded) you can't "drive through" it. Engine is fresh and has excellent (190psi) and equal compression. Cam timing and valve gaps are all spot on. Metering unit is timed correctly, all injectors are spraying a good cone pattern with no dribbles or bleed back. I have replace or rebuilt all of the ignition system at least twice. New coil, leads, cap, rotor arm, plugs, points, (tried electronic ignition too). The fuel system is OK, pressure seems pretty constant over 100 psi o...