Intel stock is heading for its worst day in over three years after the chipmaker's earningsThe tech-heavy Nasdaq is the only major index swimming in red ink this morning, and Intel Corp (NASDAQ:INTC) is to blame. The semiconductor stock is down 11.7% to trade at $43.85 at last check, on track for its worst single-session drop in over three years. Intel reported fourth-quarter earnings and revenue that topped estimates, but a first-quarter revenue forecast that came well below expectations is driving the plu ...