Ben
The van has been sitting for 2 months and you should expect to hear noisy
lifters for the first 10 miles atleast. I do agree that you are in need of
an engine job because of your past expericance with  dynamic warning system
buzzer but the sound you are hearing is nost likley a lifter or 2
Call me if you feel the need
1 508 358 6264
Bob Donalds
http://www.bostonengine.com