NEW YORK — A sell-off for tech stocks is barreling into Friday and forcing the U.S. market down again, with Intel and Amazon helping to lead the way this time. The S&P 500 fell 1.6 percent and was on track to erase its gain for October, even though it set its all-time high during the month. The weakness for technology stocks dragged the Nasdaq composite down 2.5 percent, as of 11:48 a.m. Eastern time. The Dow Jones Industrial Average fell a more modest 0.7 percent, or 380 points. Intel tumbled 28.6 percent and is flirting with its worst day since 1974, even though the chipmaker reported a stronger profit for the latest quarter than analysts expected. It gave a forecast for profit in the final three months of this year that fell far short of analysts’ expectations. CEO Lip-Bu Tan said the personal-computer industry continues to feel pressure, which hurts demand for Intel’s CPUs. Amazon fell 1.9 percent after reporting a weaker profit for the summer than analysts expected. Potentially more concerning for investors was Amazon’s reporting that it burned through $42.4 billion of cash