i have a 99 Z24,  sometimes at a light or when a crowd forms i rev my car up to show off the ehaust,  i know it sounds dumb,  but my car is in europe and they cant get enough of it.  but it take soooooo long to come down to idle.  what can i do to make the revs come down faster.
 
sorry,  its a 2.4 automatic,  but i will be doing the 5 speed isuzu swap......is that what makes the difference? Trannys?
 
How high are you reving it up?  And Are you reving it up in park or in neutral?
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Just a cavy huh?  Wanna race? 

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the throttle cable may have some sort of obstruction or may be too tight I had a similar problem and it was easily fixed by loosening the cable. Other than that I guess it could be IAC sensor or TPS sensor.
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Yes officer I knew the speed limit was 50
 
in Neutural.....sometimes when i go down a really steep long hill (3km), i would put it in neutural and coast down,  at the bottom i would forget that its in neutural and hit the gas to go faster.  the revs go well into 6000,  and it takes so long to come down,  but i dont think its the cable, it doesn't seem tight.