Stocks continue to trade with weakness. Broad pressure has even kept many automakers in the red, despite strong monthly sales results. Ford Motor (F 14.68, -0.37) said that its U.S. retail sales for February increased by 23%. Chrysler reported a 13% annual increase in February sales. General Motors (GM 32.64, -0.77) reported a 49% year-over-year surge in February auto sales. Nissan Motor (NSANY 20.62, +0.22) reported U.S. sales for February increased almost 32% year over year.