I've just installed the Motronic ML4.1 loom on my 205 Mi16, after quite a few teething problems. I finally got round to taking her for a test drive and it wasn't perfect. Under gentle throttle it runs fine, the idle seems good and revs cleanly when not under load (i.e. stationary in neutral). However when I try accelerating hard it is very hesitant between 3k and 5k rpm, and I think it is more likely to be ignition related as the rev counter looked a little shaky (though it is difficult to tell).
It does it all the time, so I don't suspect a loose connection. The coil is new, as are the HT leads, dizzy cap and rotor arm. The ignition amp is new too, but is an Intermotor one (is this likely to be a problem?). The AFM seems to give a smooth resistance reading when I move the flap, so I think that's OK.