Paul Cook admitted frustration in Pompey’s inability to see the game out at Carlisle, after his side drew 2-2 draw at Brunton Park.
Having trailed 1-0 at the break following a Danny Grainger penalty, the visitors rallied to take the lead in the second half.
Loan strikers Caolan Lavery and Marc McNulty turned the game on its head to see Cook’s side on the verge of a first League Two win in five outings.
However, a last-gasp Grainger blockbuster denied the Blues a deserved victory.
Cook said: ‘It was a good game, a very competitive game.
‘I thought we were in the ascendancy for long, long periods but unfortunately we have been done by two sucker-punches
‘Great credit to Carlisle for keeping going and plugging away.
‘I thought we could have went on and got that third goal when they were coming on to us but unfortunately we never.
‘But these things are sent to test you – you get the joys of when you do score late on like at Luton and against Morecambe.
‘And then we have the disappointment of conceding late today, like we did against Stevenage.
‘They are two big goals against us because with four more league points we would all be a lot happier.
‘Unfortunately for us we haven’t seen the games out and that’s maybe something that we have got to learn to do better.’