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Sierra 2wd won’t idle. Doing my nut!

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Old Oct 12, 2025 | 03:30 PM
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From: Larbert
Default Sierra 2wd won’t idle. Doing my nut!

I’ve got this thing nearly right.
All new loom, sensors, PF01, plugs etc.
L6 Stage2 on new proper Greens.
Starts on the button. Revs nicely.
It just won’t idle for more than 5-10secs.
All the settings are as per forum experts.
Im going to change Amal valve this week but wondered if it’s something obvious to someone else.
Cheers.
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Old Oct 26, 2025 | 07:15 PM
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Guinnless
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From: Lancashire
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It should idle with the ISCV disconnected. Have you checked the base idle screw underneath the throttle body?
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Old Oct 26, 2025 | 09:49 PM
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From: Larbert
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Originally Posted by Guinnless
It should idle with the ISCV disconnected. Have you checked the base idle screw underneath the throttle body?
got it now. Took plenum blank out and replaced one way air valve. Idles and goes great but won’t boost past 12psi due to voltage issue. Working on that now…
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