Thanks for the info. How do I diagnose the vaccum problem?

 

Your favorite auto parts stores sell a vacuum testing device.....I believe it's called the Mighty Vac Vacuum tester.

Mine has proved to be pretty invaluable to me thus far.

I use a Haynes Repair Manual, others like the Chiltons Repair Manual.

There's lots of tests in these manuals for tracing vacuum problems....however, my Haynes manual assumes that you are using the "stock" vacuum lines and fittings/connectors.

Replacing a fine diameter hard vacuum line with a rubber line that fits isn't a compatible replacement. The two of them will flow vacuum at different rates.

Likewise, some of the FORD vacuum line connectors funnel down to reduce vacuum flow.
It's all kind of confusing at first, but once you realize that the "coffee can" has to have stored vacuum ready and on demand while the truck is running (ie. EGR valve opening, tad solenoid operating and all of the other vacuum users), it'll all make sense.

You've got some work to do.

Bob