Have been running engine with O2-sensor disconnected for past couple of
weeks.  Engine performance okay in other regards with sensor
disconnected.  My Son and I put in new O2-sensor this afternoon.  We
made sure connections were tight and connector end of cable was not
grounded.  Once engine is warmed up, it lacks power when starting from a
stoplight.  Nothing much happens when you push down on the accelerator
pedal until engine get some speed on it.

Any suggestions on next steps?

John

'84 Vanagon, 1.9L engine