A John Baird penalty miss in the dying seconds meant Falkirk spurned the chance to extend their advantage over third-placed Hibernian after a surprise 2-1 loss to Livingston.
Falkirk controlled the first half but their profligacy in front of goal was punished by former Bairn Jordan White and Sam Stanton goals in the second half.
There was late drama as Will Vaulks gave Falkirk a lifeline bundling home from close range before Baird missed his spot kick after Longridge brought down Miller in the box and was sent off.
Falkirk still have a six-point gap over Hibs but have played three more games while Livingston’s chances of avoiding relegation have improved and are now just two points behind 8th placed Dumbarton.
Houston was disappointed with the defeat. “I’m very frustrated, I’ve got to give credit to Livingston then came and did a job on us. We were too slow and lethargic and the boys in there are disappointed.
“They are the type of boys who will learn from it and bounce back from it.”
Livi boss David Hopkin said: “We had a game plan. We done well to nullify Falkirk’s threat and everybody played their part. To go 2-0 up I think we switched off when we went 2-0 up. We have a young team, they get the penalty and you’re thinking ‘oh here we go’ .
“But the result was no more than we deserved. We were well organised and hit Falkirk on the break and we limited Falkirk to very little.”