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He means FK konigsports (the adjustable damping version). But i say the only height adjustable FK highsports are more than sufficient on a 1.2. Got them on mine and they are really good coilovers.
Why don´t you get a specialist from here have a look at the car? afterwards you can decide if you get it done or sell/bin it. Clios aren´t bad cars but they don´t have the build quality of a BMW, Porsche whatever...
Lambda would make sense. Mixture regulation is only activated until 4.8k rpm. Everything above runs open loop afaik. You could swap the Lambdas and check if this cures the problem! Otherwise the fault would/could be ignition related.