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Had exactly the same issue with my '77 C3. Something to try is 'blipping' the throttle manually (using the little lever on the throttle body in the engine bay) Rev it up to 3000 then release. Mine settled down to about 2000 but when pushing (very gently) down on the mixture adjustment screw using the allan key tool I found it then dropped down to 1000. Conclusion..sticking air flow sensor. Gave the lever a good clean with isopropanol and now works a treat. Hope this helps...
Mark
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