Investors struggled to comprehend new inflation data as the stock market tried in fits and starts to move higher Tuesday. The markets awaited Wednesday's Federal Reserve ruling on interest rates and further guidance on where those rates are going next year. X The Labor Department's Consumer Price Index at first sparked the Dow Jones Industrial Average to gains of more than 100 points in premarket trades. The S&P 500 and the Nasdaq followed with substantial gains of their own. Those advances were pared around the open and in morning action. The Dow seemed to gain a little momentum as the…