Coasting and pulsating

[jdsjlv@xxxx]

With all of the posts regarding hesitation, ect. I figured I would comment on 
how my D pulsates while coasting. Yesterday I was cruising down a flat road 
in my home town. I had my foot resting on the accelerator and I was in 3rd 
gear. My RPM's were right on the 2100 mark and my speedo read 35 MPH. What I 
felt was a slight pulsation, almost as if the car was trying to keep up with 
the pace given the consistent placement of the accelerator. If I pressed down 
more on the pedal or released it, nothing out of the ordinary would happen, 
either it would accelerate strong or decelerate accordingly. My question is 
this: given that the D is a CFI engine (right?) would this explain the 
pulsating at a consistent speed? I don't feel it unless I really concentrate 
on it, or If I go slow enough. Last year I had my micro switch (the one near 
the accelerator spool) replaced and my car is properly serviced. Has anyone 
experienced this before? To better explain the feeling behind the wheel, 
imagine sitting in a chair and ever so gently moving forward and backward - 
that's what it feels like! Any ideas???
Thanks,
Joshua D. Schwartz
001292
Trumbull, CT