United slipped five points behind champions Chelsea in the Barclays Premier League at the weekend following a goalless match at Sunderland.But it is the points dropped in draws at Fulham, Everton and Bolton Wanderers that have most irked their manager.Ferguson said, "this present team doesn't kill off sides as well as they should. At Goodison, we had three or four chances at 3-1 to really put the game out of sight, but we were wasteful and ultimately paid the price"."We threw away two goals in injury-time. That's unthinkable. That killer instinct just isn't there at the moment and it's something we need to develop. We haven't had a problem scoring goals"."We got three against Liverpool, Everton and West Ham, two away at Fulham, three in the Community Shield; that suggests we don't have difficulty finding the net"."What we're not doing, though, is killing teams off. I have no doubt the players have taken these setbacks on board. They suffer just as much - if not more - than the rest of us"."They're the ones throwing the points away and they're the ones who know fine well that they're good enough to win this league".United have been criticised for some of their performances this season but Ferguson said, "We're playing well, and perhaps those four points we have dropped away from home at Fulham and Everton have given off something of a false impression"."Nevertheless, we didn't like letting those points slip away and it's crucial that we don't make too many more similar mistakes this season."Source: Premierleague.com