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I had a similar problem with my Ford Ka...
Hi there, my Ka had a similar problem, which was traced to an HT lead, once it was replaced - all was fine. You've replaced them - did it make any difference? Just a thought, that's occured, they have been put on the correct plugs, as this would give a similar symptom to what you describe?
Definitely sounds electrical to me, maybe an earth strap being loose or a poor connection somewhere.
It might be quicker, easier & cheaper to get the car to an auto-electrician unless you are very confident in your own abilities to check this.
If its any consolation, I don't think its a major repair that's needed - but its better seen to sooner than later - you can damage your catalyst.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater