Well, that happened to me, once they made a bad oil to the engine, it seems that I had residues, and the engine oil pump did, and if the engine you know that it is fine, it verifies if it is not reaching enough oil to the bumps when you accelerate, it must be that the oil pump no longer has the pressure that should or the hydraulic drummers are spent, check those two parts, you know that the engine must be Do because it may be one of those problems and then the engine is fundada e é tarde demais.