Newbie needs help on misfire???

Hello all,
I am very new to this site and hoping someone may be able to help me. I have a 2002 Tahoe that is misfiring on #6 cylinder. I have replaced all plugs, all wires, and coil pack on #6, and is still misfiring. Does anyone have any suggestions as to what the problem might be. Any help would be greatly appreciated.

It could be a high flowing injector problem. A search on this forum found these for you to read.
http://www.automotiveforums.com/vbulletin/search.php?searchid=983185