Very light throttle bucking

["Sean Ford" <sean@nwh.org>]

Q-list query alert!
  I've noticed in the last few days a strange bucking at very light throttle.
This has become most noticible in secondary road traffic (the kind that always
seems to be moving at 35 mph) where you are almost coasting along. It's also
apparent, almost like driveline lash (if it were a motorcycle I would think the
chain was loose), when lifting off the throttle.

  Examples: I'll be driving along, anywhere below 2500 rpm, and when I lift off
the throttle, there's a secondary "bump" or jerk. Or... I'll be driving behind
someone who begins to slow down, I slightly lift off the throttle, but not
completely (just below maintaining road speed), and if the rpms drop to
somewhere between 1800 rpm and ~ 2200 rpm, I can feel a slight bucking, like a
series of the aforementioned bumps/jerks.

  Does anyone have any idea what this might be?

Sean Ford
sean@nwh.org                       '92 Audi 100CS 5spd 29K mi
Newton-Wellesley Hospital      '89 Suzuki Katana 600 14K mi
Newton, MA  02162 (USA)      http://www.geocities.com/MotorCity/Downs/5528