[Vwdiesel] rev issues

[Bob Soukup]

I'm curious about this "fuel delivery screw".

I had the injection pump on my NA rabbit truck overhauled some time back
and when I re-installed the pump the idle speed was much too high.  I
adjusted the idle down as far as it will go but now the idle is very
inconsistant.  Sitting at idle the engine will spontaniously pick up its
idle speed then drop back down, over and over.  Putting a load on the
engine such as the air conditioning seems to keep the idle speed constant.
Also I notice now that the truck smokes under load where it didn't before,
it seems to have more power, and the mileage is about the same.

Could it be that the fuel delivery screw is not set correctly?

Thanks,

Bob Soukup