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My problem is, a whistle (or blowing) engine that has suddenly disappears 2000tr, and a lack of approval (lack of torque and accoups).

But as soon as I pass the 2000tr, so good.

My first was...

Mon probleme est, un sifflement (ou soufflement) moteur qui disparait brutalement a 2000tr, ainsi qu'un manque d'agrement (manque de couple et accoups).

Mais dés que je passe les 2000tr, tout va...

hello,
I'm french, so I speak little English. (thank you google trad)

Do you have finally found the solution to the defects 2505 2503?
because I have the same on my car, idling my car is...