As posted earlier, you may have to look under the hood for the vacuum line going to the firewall and follow it to the manifold to see if it is cracked or came off.
Edit. Read this Autozone how-to (especially Figure 2) and see if it helps.
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1b/cf/77/0900823d801bcf77.jsp
Last edited by Tony2005; 02/21/06 04:25 AM.