Broken manifold bolt.

Need some major help here. I replaced the cylinder heads on my 95 Ford
Aerostar. My problem is when I went about torquing the fasteners to he
intake manifold.. one of them broke off in the left head . its the one
thats in the rear outside.. I am not sure what to do about this.. Will
leaving one out cause a major intake Leak? for some reason my torque
wrench didn't click like it was supposed to and thus lead to the broken
bolt .. and yes I did do it according to sequence. this is a 3.0 engine.