The Dollar index stumbled in the London morning session, hitting a low in early N.Y. before rebounding modestly. The index approached the three-week low of 90.12 seen on Tuesday, later topping at 90.65. Rising price pressures in the Markit PMI reports lifted yields, which provided support to the USD, as did pre-weekend short covering. Incoming U.S. data was light, and revealed a near in-line outcome for January existing home sales. Wall Street started on a strong footing on Friday, maintaining modest gains through the morning session, before stumbling some into the close. Incoming U.S.