Last-gasp Mo boosts Lions
Zambia went ahead inside ten minutes through Jacob Mulenga before Geremi equalised and Samuel Eto'o gave Cameroon the lead in the 72nd minute.
Zambia's Christopher Katongo scored an 82nd-minute penalty but Idrissou had the last word four minutes later to earn a 3-2 win.
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Hide AdThe Indomitable Lions were looking to ignite their campaign after a shock 1-0 defeat by Gabon in their opening match. Gabon added a goalless draw with Tunisia to their opening win as they put themselves within touching distance of the last eight.