Spluttering and losing power at 6k revs Clio 200

Yea I had seen a good bit about it so is hasn't and isn't really worrying me. Just thinking of servicing it myself as Charles hurst said the serviced it and stamped the book but I don't trust them one bit with the way they've fucked me about


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A dodgy Coil or plug won't show an error code, or at least they didn't on mine. I had a clear failure of Coil no. 3 but no fault was shown however once replaced it ran like a dream.
The only other option could be a failing knock sensor, mine wouldn't rev past 5k revs when I bought it and that was to blame.


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