Thanks to everyone for the help.  Love you east coast guys.  Posted the
question before bed and had lots of suggestions in the morning.
Since most sent their suggestions directly to me I would like to
summarize for the benefit of those searching the archives in the
future.

2 places to look
Throttle Positioning Switch: Check per Bentley pg24.58
Idle Stabilizer: Clean and/or adjust

On Jun 25, 2005, at 12:00 AM, Barrett Willet wrote:

> '88 2.1l Vanagon Wolfsburg
>
> Recently started having troubles with hesitation during acceleration in
> the afternoon when heading home from work.  Makes you think twice about
> when to pull out into traffic.
> Routine works out like this...
> No problems with idle stability and no hesitation in the morning on the
> way to work.
> After the van has sat for the day and I start out for the trip home the
> idle is acting pretty erratic(500-900) and the van hesitates when
> accelerating from a stop.  Almost feels like its starved for fuel.
> This hesitation goes away after a few miles or so but the idle remains
> erratic and I experience a slight bucking but pretty rarely.  Not the
> vanagon syndrome type of bucking
> All of these symptoms happen in the afternoon and are gone in the
> morning.