Diomansy Kamara put the Foxes ahead before a Paul Gallagher brace and Patrick Van Aanholt's late goal secured a convincing victory.
Eriksson said he was delighted with the performance but admitted he was disappointed his players could not reproduce the same sparkling form on a weekly basis. The win puts City within five points of the play-offs with six matches left but the Swede feels they could be closer.
Eriksson said: "We were back to form, it makes me happy but also I am a little bit angry. It was a top-class performance from everyone, including the three subs. Everyone did fantastic.
"But we should be playing like this more often, and that makes me angry. We were focused. There were no mistakes, we were patient after going 1-0 in keeping the ball - top, top class.
"But the players we have, and the team we have - we should do it more often. So I hope we can do it for the last six games because if we play football like this, it is not easy to beat us. We have played good football in most of our games, not every game, but we have made silly mistakes that have cost us a lot of points."
Source: PA
Source: PA