Hi all,
For about a week now, at different rpms, but always when I am at low throttle,
my car hesitates or stutters very badly, as if I were accelerating and stomping
on the brake at the same time.  It happens at anywhere from 2500 rpm to
3000-3500 rpms, in first through third gears.  It only happens if I hold the
throttle at those rpms - if I mash the gas, it will roar through it and not
stutter.  The other thing, if I am idling and I steadily raise the rpms through
that 3500 mark, it doesn't stutter.  I also noticed that it only seems to
happen when the car has been running for awhile and is warm.

I have an HKS VPC and GCC hooked up, and I think I have them properly tuned,
that is, I'm not running too rich or too lean, according to the readings I get
on the GCC.  (If anyone has the manuals to either of these, I'd REALLY
appreciate getting a copy of them, and I'll pay for 'em, too.  My mechanic
won't touch that stuff without the manuals).

The car recently was dying at idle, so I had the ICS (stepper motor) tested and
found that it's bad, so I'm having it replaced.  Would the ICS have anything to
do with this new and very irritating problem?  I also bought some fuel injector
cleaner, haven't tried it yet, though.  Would the throttle position sensor have
anything to do with it?
Thanks for any and all help or suggestions!

Al
1991 3000GT VR-4