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Idle in the TBI is controlled by the computer, and other things. Not real familiar with these newer fuel injection systems so I will leave it for more informed members.
 

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My 87 TBI 350 idles high because the main housing gets worn out where the main butterfly shaft runs through it so it hangs up and keeps the throttle cracked open a bit causing the high idle. If I quickly pop my foot on the pedal and let it pop up it will idle down to normal. I have been told you can have it worked over for a couple of hundred clams but I may just go with a aftermarket TBI instead.
 
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