cylinder 2 missfire help needed?

hi guys ive got a bit of a missfire,its not bad but its there,when i plug my fault code finder in its saying cylinder 2 missfire,ive changed all my plugs and 4 new coils last week and yet its still there,also sometimes it will say lambda sensor number 1 fault aswell,would this make it come up that theres a missfire in cylinder 2 ?ive got a smell of fuel when i boot it too,could this be down to the lambda?thanks for your help guys