Spoke too soon. Next day 29Cc and 29CD back again. Once when cold and later when hot. A “misfire” is probably not a good description, it is more like a shuddering then the CEL flashes and sometimes goes out but if it stays on the car runs poorly which I assume is “limp home”. If I use my scanner to clear the fault the car will instantly run better. I now carry the scanner in the car at all times. As usual any suggestions would be welcome. In case you are new to the thread here is a summary of what I have done:
Swapped plugs, replaced plugs
Swapped coils, replaced coils
Swapped injectors
Swapped Vanos solenoids, replaced Vanos seals (x8)