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post #4 of (permalink) Old 22nd February 2009
Technical Supremo

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If the engine misfires it will cause it to judder. Try removing one HT lead at a time and see which ones makes little or no difference to the running
Beware removing the leads whilst the engine is running or you'll get an electric shock
You could also try removing the spark plugs to see if they are all the same colour. The darker ones are more likely to be the ones that are misfiring
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