I want to put my IAC on a switch so I can turn it off when my car is warmed up or on the highway so it doesn't hang at 2k when in neutral. My Haynes book doesn't say what wire is power signal ground. I know its four wire and understand steppers only a little but this would be a easy fix for an annoying (to me) problem. Also can save gas over time.

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99 Eclipse gs (Daily)
89 Honda Crx (Drag car project)

There is no OFF position for the IAC. Killing power to it will only leave it in its last position.

Read up on steppers on the msextra manual as well as Googling to find out how the two circuits function.

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2012 2500HD LML

That's what I'm trying to achieve. I didn't think of msextra. Also I'm going with stock ecu for right now. I want to put MS through more tests before I install it. My motor is burning oil and is worn out so low compression 2.4 will suck n/a but will have to suffice for now haha.

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99 Eclipse gs (Daily)
89 Honda Crx (Drag car project)

Are you sure it's not a vac leak?

yea it only does it when moving. Others on here have it do it and say its normal. plus my vss is messed up I have no signal to computer but in neutral it is a 850-950 rpm. so yea seems normal haha.

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99 Eclipse gs (Daily)
89 Honda Crx (Drag car project)