Another piece of experience to throw in the pot.
2 years ago, I started having 2000rpm sticking problems with the associated electical fault light occuring. It was easily fixed by disconnecting the battery for a second. The problem got more and more frequent until recently when it became virtually permanent. The local garage cleaned the
to no benefit. The Renault garage, after about an hour and a half work, advised it was almost certainly due to a
fault. Other possibilities were fuel injection computer (very expensive). The new
seems to have fixed the problem (2 weeks and no repeat) and cost about £250 for parts and labour for diagnosing and fixing the problem. Surprisingly reasonable for Renault!