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Re: espace 2.2 dci
The reason for the increase in power is probably that the engine management system is detecting the problem and then ignoring or disabling the faulty component, restoring normal performance.
The best way forward is to start by having the fault codes read by a good independent or dealer, and then carry out further tests to find the exact cause of the problem.
Regarding the slight misfire, the best starting point is a relative compression test. If that is ok you're probably looking at an injector or software fault.
Currently in Disgusted's garage:
Renault Kangoo 1.5 dCi 70PS, LDV Sherpa 2.0 VTdi 140PS, Vauxhall Vivaro 2.0 CDTI 115PS.