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Update:
Definately an oil in the plug well issue. Cured the misfire by dropping in new plugs and replacing the cam cover and oil well seals - for about 5 miles, when stopped to find smoke pouring out from under the bonnet and an engine on 3-4 cylinders. Had been supplied with wrong cam cover gaskets which were leaking oil onto the exhaust manifold, hence the smoke, and preventing the spark plug well oil seals from sealing properly, hence oil dropping onto the plugs and a misfire.
Took the rear bank (the only one that had failed in the first place) apart again and found so much oil in one spark plug well that only the very top of the plug was visible. On the next one it was half visible and on the next it was mostly visible.
Now have the correct cam cover gaskets and cleaned up plugs and confident all will finally be well, on this front, after remaining reassembly tomorrow.
Richard :-)
164 24v Super 1995 - UK spec.
PS. Dumped my K&N for a standard filter at the same time - looses a bit of top end but prefer to have proper filtering instead of extra engine wear.
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