That's where proper application of a hammer comes in.  Tapping lightly with a steel one, or banging with a rubber one.  Be sure to replace the gasket, it's shot: http://www.van-cafe.com/home/van/page_161_137/throttle-body-to-intake-manifold-gasket.html 

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of John Rodgers
Sent: Wednesday, July 01, 2015 4:30 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Throttle body

Help!  It's totally disconnected,including the fastening screws, but I
can't budge it. Any sugfestions?

Thanks

John