mgf misfire in wet

Hi all ive a early 1995 mgf vin ending 274 , great fun to drive but has now got annoying misfire in the wet or really damp , seems to be after a couple of miles driving , at between 2000 and 3000 revs , trying to stall the car , ive changed plugs , leads , distributer cap and rotar arm , cleaned main ecu conector , but now at a lose so hope some one can point me in the right direction please

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