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It is not adjustable, sealed from the factory. DO NOT FULL WITH IT

There is no conventional idle adjustment for the TBI motors, but if your willing you can advance or retard the timing by rotating the distributor housing a couple of degrease, but not to much. This will raise or lower your RPM a bit.

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14y ago

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Q: How do you advance idle on 1990 Chevy 350 truck?
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