Well if you read my last post all pointed to petrol pump failure,but because i had put a new Bearmack pump in about 3 months ago i found it hard to believe the pump had failed so soon.well i had no other option but to take out the pump.The pump looked like it had been in the tank for over a 100 years,it was all corroded and covered in a thick brown sticky tar like gunk.When i put in the new pump i syphoned off the old petrol in the tank,but obviously that wasn,t good enough.This time i,ve cleaned the tank and wiped down the inside of the tank with a clean cloth.I think this may of been the problem all along with the misfire,we shall see.