If you're getting the tune up to pass State Inspection you should qualify
with the tech that that's what you expect.
I've found that with Vanagons and VW Busses of all years there can be
several elusive and expensive combinations that cause poor performance.
If a reputable shop is doing the work and supplying the parts at retail then
the $160.00 sounds reasonable.
Considering that a tune up can be anything from setting the timing and
replacing the plugs to replacing every part of the ignition and FI system
required to get it to perform properly.
The $160.00 with parts sounds like a real bargain to me.
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By the way Larry .......... you wasted your money on that Optima Battery, it
was the dog gassing off all that time.

Stan Wilder