Petrobras (PBR) is one of the stocks most watched by Zacks.com visitors lately. So, it might be a good idea to review some of the factors that might affect the near-term performance of the stock.Over the past month, shares of this oil and gas company have returned +8%, compared to the Zacks S&P 500 composite's +1.2% change. During this period, the Zacks Oil and Gas - Integrated - Emerging Markets industry, which Petrobras falls in, has gained 10.6%. The key question now is: What could be the stock's future ...