After 2500 revolutions the drowning vehicle

Greetings.
The vehicle after the 2500 revolutions without speed or with any of them while the vehicle circulates, it seems that it drown, loses power and is spending double gasoline, the vehicle refines and remains the same.
I have a Nissan Almera Sport 2002 and sporadically began to have the fault and later (now) it is not removed and they tell me that it can be a valve of the carbure body; I'd like opinions to be sure that it is. thank you.

See to be sure it would be to check it a technician, an answer is missing if the light of Check Engine is lit on the Dahs or board if it were so that it would shine it for what you say it seems to me that this Nissan is Mexican and in effect whether it is possible, it is possible, air flow sensor should clean it, it is possible that the possibility that this obstructed catalyst damaged I hope will serve.