A month has gone by since the last earnings report for General Motors (GM) . Shares have added about 0.2% in that time frame, underperforming the S&P 500.Will the recent positive trend continue leading up to its next earnings release, or is General Motors due for a pullback? Before we dive into how investors and analysts have reacted as of late, let's take a quick look at the most recent earnings report in order to get a better handle on the important drivers. General Motors Q2 Earnings Top EstimatesGeneral ...