General Motors (NYSE:GM) stock is falling today after Tesla’s (NASDAQ:TSLA) dismal second-quarter earnings report. Shares of the “Big Three” automaker have been volatile today and GM stock is falling along with most of its peers as Tesla’s poor revenue and EPS drag down the entire sector.That doesn’t mean General Motors reported poor earnings, however. On the contrary, the company raised its full-year guidance after beating Wall Street estimates on several key metrics. But GM has also confirmed delays with ...