Argyle soared to 15th on the back of two goals by Scottish striker Ryan Hardie, who also set up top scorer Morgan Whittaker for his 15th Championship goal of the season to cap a player of the match performance.
Cardiff had taken a 10th-minute lead through Perry Ng.
But Foster couldn’t have been happier with the response on what proved a special day.
Foster said: “The message to the players was to claw these (Cardiff) back. I think they were six places and seven points above us. If it becomes 10 it’s almost impossible. It’s four now.
“We expected a difficult game and they always are at this level
“I am really pleased with the players because there was evidence again today that they are taking on the information we are giving to them.
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