Substitute Joe Pigott struck in the third minute of stoppage time as AFC Wimbledon moved out of the League One relegation zone with a 1-0 win over Bristol Rovers.This was a much-needed tonic for the Dons, who had lost their last four games, but they are now one point clear of the bottom four, with Oldham taking their place.Liam Trotter lifted a good early chance over for Wimbledon after Cody McDonald had headed back Andy Barcham's cross.In what was a first half of few chances, Liam Sercombe looked set to give Rovers - unbeaten away from home in two months - the lead, only for Deji Oshilaja to get back and make an excellent block.Joe Partington then had a rare shot on target for Rovers, as his powerful drive from 25 yards was beaten away by Wimbledon goalkeeper George Long.Just when the match looked to petering out to a dour draw, Pigott snatched the points at the death for the Dons, planting a downward header from Harry Forrester's cross into the net.