U.S. stock futures wavered on Tuesday as investors awaited a spate of corporate earnings and braced for key macroeconomic catalysts in the coming days, including a Federal Reserve interest-rate decision due Wednesday. The outlook for inflation and the Fed’s path on rates remains a dominant narrative for markets, spotlighting the central bank’s two-day monetary policy meeting starting today and culminating in a decision and press conference on Wednesday. More immediately, investors have much to chew on from corporate earnings with almost 200 companies in the S&P 500 reporting results this week.