Today I went to diagnostic man (its not possible to plug that car at Renault dealer here- they dont have equipment) but that man checked all the tings from diagnostic plug and last he found that throttle position sensor earthing cable was broken - that was all. Now the idle is 900 +/- 50 and everything is ok. He said that when the idle is moving a little it can be a little problem of lambda sensor - it can fail in the future.
Happy end.
Rein