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Turned out I'd been hit by this supermarket contaminated fuel thing - O2 sensor changed - running well now (on decent fuel!)
Large bill (£500) on it's way to Asda who have admitted having contaminated fuel at that particular store.
Seem like Renault's in general have been badly hit by this.
My 2001 Clio 172 has a bad intermittant misfire - feels like a couple of cylinders not firing.
Plugs have been replaced with correct NGK's (the one's removed looked a little worn but a good colour and all even)
Leads been replaced with Magnecor's - still misfiring.
I guess it's one of the...