Make sure that the inside of the distributor cap is dry.
Occasionally when you clean an engine, water will enter here and cause hesitation and missfire.

Todd
'88 Westy

> ok, here is a new one:
>
> thought everything was fixed ... it was running great! Then, I washed
> and detailed the engine. We drove around, and everything was fine. After
> being parked for about 30 minutes, we got back in to go back home. The
> van started hesitating, to the point of not moving. We turned it off and
> on several times and it took us home... about a couple of miles driving
> on and off. Towards the end, it worked fine. We parked, turned it off
> and on again, and I heard a clapping noise from the black plastic box
> (where the 4-pin connector plugs in) on the Intake Air
> Sensor/AirFlowMeter (025 906 301 C). As the flap that is inside was
> abruptly snapping on the housing or a bad electrical spark in that black
> box.
>
>
>
> We are letting it sit for tonight and see what tomorrow brings.
>
> Any thoughts, suggestions on that?