Gary Johnson´s side fell behind to a goal from Darren Ambrose in the eighth minute at The Valley, where he coolly slotted the ball past Adriano Basso from 12 yards.
But centre-half McCombe - who had not scored all season until a fortnight ago - made it three goals in four games, rising unmarked to nod Lee Johnson´s corner past goalkeeper Nicky Weaver in the 62nd minute.
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