The New York Rangers aren't panicking yet, but concern has crept into the club that has been coasting atop the Eastern Conference for most of the season. They still hold a seven-point lead over the defending Stanley Cup champion Boston Bruins, and are eight points clear of the hard-charging New Jersey Devils -- the Rangers' closest pursuers in the Atlantic Division. But bad habits and careless play have become more the norm recently, producing a slump for the first time in more than two months. P.A. Parenteau scored two goals in regulation and linemate Matt Moulson netted the winner in the fourth round of a shootout as the New York Islanders outlasted the Rangers 4-3 on Friday night.