hi, my 164 has a misfire that you wouldn't notice when idling?, but gets progressively worse as the speed increases, pretty bad at 60/70, but never cuts out? tootling around at 30/40 it's bearable. I have changed the 6 plugs and also fitted 6 new bosch coils while I was at it, because it's such a faff getting the plenum off, but no difference was noticed. I was wondering if the ECU could cause these symptoms, or does that either work or not work with no inbetweens? btw this all came about when the crank sensor failed and a new bosch one was fitted, she has had the misfire ever since.