[natedogg]

There is a vaccum line the runs from the manifold through the firewall just above the trans dip stick. Check to see if its cracked or broken. The one on my 85 was broken and just hanging there. However there is two vaccum actuators on the heater box. One is next to the gas pedal and the other is between the box and firewall. The box has to come out to get to it. I hope this helps.