The first half was poor, with neither side having a shot on target until just before half time when Matt Bloomfield was allowed time to score after beating David Lucas.
On 47 minutes Billy Paynter equalised for Swindon with a close range header after a cross from McGovern.
Swindon thought they had scored mid way through the second half when Austin got the ball in the back of the net, but it was ruled out due to offside.
On 77 minutes Wycombe were awarded a penalty. This kick was at first saved by Lucas, but seconds later Wycombe scored anyway with a goal from Revell.
A few minutes later on 83 minutes Swindon once again equalised with shot from Sheehan finding the back of the net.
Overall a poor first half, and better second half, but Swindon didn't play well enough to win. This just about rules out any chance of getting second place now that Leeds are 4 points ahead with only 2 games to play.