A midweek trip to Devon always had the makings of an awkward trip for a Coventry side focused on Premier League survival. Such feelings evaporated when Frank Lampard’s side raced into a two-goal lead inside five minutes, Taiwo Awoniyi opening his account for his new club before Jack Rudoni added Coventry’s second. But, ultimately, Coventry were made to toil before earning victory. Plymouth had form for a cup upset and another was brewing when Xavier Amaechi pulled Tom Cleverley’s side level nin…