Thanks for the comments, folks; I've already replaced the 3 coil to plug connectors in the past 12 months when one of the coils failed with code 22.

Maybe a miss is the wrong description; is more like the engine completely cuts out when the problem occurs. Acceralator floored and nothing happens, like someone turned off the key. This is why I suspected OVP. I will monitor power after the relay to debug.

I'll check pin 8 once again for codes.

Thanks.

__________________
as ever
Paul

1989 560SL
1987 300SDL
1987 300TD
1983 BMW 633CSi
1972 280SE 4.5