Daniel Johnson gave them the lead with an 89th minute penalty but Coventry pegged them back with an equaliser from Jacob Tavares in the seventh minute of stoppage-time.
It was so frustrating for the Lilywhites, some of the added-one time due to two home fans running on the pitch between the award of the penalty and Johnson scoring it.
Here are the PNE player ratings from the game, with defender Sepp van den Berg taking the starman award for the visitors.
9. Josh Earl 6
Targeted in the first half by the hosts, left wing-back Earl improved in the second, looking more confident. Subbed in the 73rd minute. Photo: Mick Walker/Camerasport
10. Cameron Archer 6
The striker had a quiet game by his standards but still created a chance for Evans and forced the keeper into a diving save. Photo: Mick Walker/Camerasport
11. Ched Evans 7
Grafted up front, forced the keeper into two first-half saves and then struck the woodwork in the second. Led the line well. Photo: Mick Walker/Camerasport
12. Emil Riis 7
The Dane replaced Earl and made an impact, showing a great turn of pace to spring clear and earn the penalty. Photo: Mick Walker/Camerasport