had another look at this on Saturday, started from cold and it missed on cyl 4 with injector switching and good kv.
removed spark plugs to inspect in cylinders and found water droplets in cyl 4.
took fuel sample and found water in fuel,empty fuel tank/rail and refill with new filter.
12 mile road test and all is well.
thanks norman.
Message Thread 
Vauxhall Corsa C 1.2 16v Z12XEP 2005 - Misfire detection P0300, P0301 & P0304 - Fixed # - Norman Shelmerdine February 11, 2011, 4:57 pm
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