Hi LittleBlue, Thank your for your time and advice. I have just saw your message (did not receive notification e-mail) Everything you said sounds very logical to me, I would just like to add info about check engine light. No, it is not lit, but once when it was behaving erratically in idle I lost my nerves pressed gas "pedal to the metal" in second gear (it is manual transmission car) almost from idle.. it started to accelerate than haistating, accelerating etc.. and I did not release the pedal. (After check engine turned on for the first time in my car) Next time when i started