U.S. auto sales slipped in September from August, initial data from major carmakers showed, adding to evidence that the market remains stuck in a slow-motion recovery at the start of the fourth quarter. Ford Motor Co was the standout in a still-slack market, posting a sales gain of more than 2 percent in September from the previous month, Reuters reported. Sales for General Motors Co were down 6 percent, while Nissan Motor Co was off 3 percent. Chrysler, now operating under the management of Fiat SpA, was up less than 1 percent. Toyota Motor Corp was down less than 1 percent. All of the automakers posted double-digit sales increases from the unusually weak results of September 2009, when inventories were depleted by the expiration of the government's cash-for-clunkers sales incentives and buyers were scarce. Automakers said results pointed to a continuing but slow recovery with consumers still too concerned about housing prices and employment prospects to begin buying vehicles at anything near the historical rate for the U.S. market. "Consumers are sending a very clear message that they will be cautious with their spending," GM sales chief Don Johnson told reporters and analysts. GM's sales were up almost 11 percent in September from a year earlier, the smallest year-on-year gain among major automakers. Sales for its rivals were all higher: Toyota (+17 percent), Nissan (+35 percent), Ford (+46 percent) and Chrysler (+61 percent). "The economy does remain hampered by the negative mix of jobs, housing and credit and it's really that troika of challenges which we think will improve gradually," said Ellen Hughes-Cromwick, Ford's chief economist. The initial sales results pointed to an annualized, industrywide sales rate for September of somewhere between 11.7 million and 11.9 million vehicles, up slightly from near 11.5 million in August because of a statistical adjustment.