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My engine idles fine at startup, but when warm it idles too low. Is there an adjustment?
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There should be an idle adjustment screw on the throttle body. Try adjusting that a little bit.
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I am having the similar trouble. I have tried replacing the idle air control and it did not work for me.
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If the IAC doesn't fix it, I'd probably look closer at general maintenance items (fuel filter(s), cap/rotor, plugs, etc.). Restricted fuel flow could cause some of that either from plugged up filters, failing pump, or bad fuel pressure regulator. Also distributor caps with some corrosion can do strange things when they warm up and resistance changes. If you go to the manuals section, you can grab the GT-40 service manual which has some pretty extensive troubleshooting based on symptoms. Hopefully, it's not the computer taking a crap on you.Comment
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Does anyone know the part number for the idle air control? Are they still available? What happens if I unplug, will that tell me anything?Comment
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You may find this old thread helpful? https://www.planetnautique.com/vb5/f...-control-valveOriginally posted by Kevin Sullivan View PostComment
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This is where I found the best price.https://www.rockauto.com/en/moreinfo.php?pk=945342&jsn=1 Comment
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