I have a 55 one of these which had an intermittent misfire which started when it was about 18 mths old. I noticed it only did it when running on supermarket petrol. It was cured through regular (and continuing) doses of Redex injector cleaner. I put this in every 3 months or so rather than with each tank of fuel. No problems since no matter who's petrol goes in and it got a very clean emissions report at it's first MOT even though it only does short runs.
Edited by Northern Jeff on 04/05/2009 at 14:58
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