I'm not sure what VSS is but I am using a Haltech F10X cpu. It contains throttle pump maps that you set to determine how much the fuel enrichment is reduced during the decay cycle or when you suddenly let off the throttle.
Another feature is the Decel Cut which stops the injector from firing at zero throttle until it reaches a pre deterimened RPM which should be set just above your idle RPM.
Go to Haltech's website. You can view all there software.
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