tracing a vaccum leak, brake pedal sags when idling.

[Kalypso]

the motor is running a little rough, a vaccuum leak seems like the prime suspect since I just assembled everything.

when I rev the motor, the brake pedal surges up, and when I let it ideal, it sags back down. I only ran it for a few moments before shutting it off.

which hose/s should I check.

thanks for any ideas...

[madrift]

i dont kno a whole whole lot about the brake sys but try checking and hoses going to the brake booster