ok boys. Here is one for you. I've taken great care to try and explain
this, as I know a good description is a must to get help from the
thoughtful folks on this forum. This is a 93 Altima, 5 speed with 140K
miles on it.

I hit the dreaded o-ring failure/oil in the distributor and broke down.
The tech put in a new distributor, wires, cap, rotor. Car ran fine for
a few days and then I started getting a slipping/jerking sensation. The
symptom is erratic RPM's  and is most pronounced when I clutch in or am
idling. Car will stall occasionally when this happens, but turns right
over fine and I'm on my way again.  Back to the shop, and the tech
replaced the O2 sensor, but that didn't fix the problem. This is a
problem even on the open highway, but not nearly as bad as lower RPM in
city traffic. At highway speed, I feel a slipping/jerking and then all
is ok. At lower RPM and clutching in, it is much more pronounced and
stalls sometimes.

Through all this, the car has not thrown a code. No service engine
light at all.  I'm driving this car up to the boonies in Maine next
week and I *don't* want to break down up there... believe me! If you've
never been there, it's *baren* and desolate. Maybe I'll hit a moose and
total 'er out and be done with it. lol.

Thanks so much for your insights, they are appreciated and have a great
'06!

Bill