s2r1000 idle

[Howie]

garp2112  is onto something here.  Usually the problems like you are having are caused by the computer trying to compensate for an engine that is out of balance.  Stepper motor opens to compensate for the weaker running cylinder attempting to raise the idle.  Now the stronger cylinder fires, idle speed is now to high, stepper motor closes to compensate.  Wash, rinse, repeat.  A little like a tank slapper.

[red baron]

The stepper does not have any adjustments, not with the VDST software or any mechanical adjustments.  It either works (properly or poorly) or it doesn't.  If it is disabled - by disconnecting the electrical connector or by plugging the air lines - you'll notice hard cold starts - requiring you to hold the throttle open a bit or a fast idle lever or button - but your idle should be stable once it has warmed up.

Maybe that's what my local guy did. It worked out great.