Hi you can try removing one at a time, put an old spark plug in the lead and then turn engine over, you should have a bright whiteish blue spark, just test each one indevidually make sure you do not touch it and also, just make sure that it is laying on the engine so it can get a good earth..hope this helps please vote thanks
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Hi you can try removing one at a time, put an old spark plug in the lead and then turn engine over, you should have a bright whiteish blue spark, just test each one indevidually make sure you do not touch it and also, just make sure that it is laying on the engine so it can get a good earth..hope this helps please vote thanks