Dear folks:

I am needing your advice on my '91 Westy.  She is running quite rough when out on the open highway (though not around town).  As you can imagine there is not a lot of mechanical options to pick from in the Yukon (no VW shop) so I thought I would give this group a try.

Symptoms:

*Sudden lurching when driving on the highway (usually after 10-15 minutes).
*With the lurching comes a loss of power (press on the gas and nothing happens for about 30 seconds).
*Lurching happens intermittently. 
*More pronounced when going up hills.
*Black smoke following "lurch".

What I have tried:

* I just replaced the airflow meter and put in a new one.
* I replaced the wiring harness (p/n025906302) a year ago.
* I don't drive it in the winter.
* Checked the wiring.
* It has an new engine... only 2year old (and only used in the summer)

Any thoughts?

Many thanks, Lyn Hartley
Whitehorse, Yukon