1993 UK Civic LSi air intake problem?
 

Just brought the above car and upon looking in the engine compartment
there was a vacuum hose disconnected which seems to suck air in from
the air intake and across the throttle body valve. The car did work
without it on but when I connected it again the car wouldn't start
after a short journey until I disconnected the hose.

Any idea what is going on here?

timtech