Van is back in it home garage.

VW Service by Ron in Daytona Beach finished repairs on Wednesday and I
picked up van yesterday and drove it back to Macon last night.  Sometime
on trip back, the O2-sensor stopped working and I had problems keeping
the van from stalling when I was at a traffic light.  Also, black soot
had come back on end of tailpipe and exhaust at idle had gasoline smell.

This morning, I disconnected wire O2-sensor and idle smoothed out.
O2-sensor (Bosch) was less than two months old.

Idle is still not as smooth as it should be and engine has different
sound than it did before.

I plan on checking the timing and engine vacuum over this weekend.

Anything else I should check?

John