Mmmm...this hit me in the face when I woke up this morning...

I installed a new oxygen sensor at the end of last year, and I used
anti-seize compound on the threads. I just realized that my famous 'bucking
syndrome' started some time after that. Some might argue that this syndrome
adds character to the van/owner, but I'm not there yet.  Don't want it!

Is it possible that this compound is interfering with the sensor's
function? The compound is made by Lock-Tite, small plastic grey jar, bought
at Canadian Tire.

The symptoms are rich-running, to a point where one of the plugs fouled and
I was running on more or less 3 cylinders.  Replaced the plugs: van is
nice, fast, and smooth (for a couple of days). Then it's running rough again.

BTW, 84 westy.

�ric