I’m just taking a stab in the dark but what about the secondaries? Is the linkage attached and adjusted so they fully close when the primaries close? If not, could it be possible after driving/opening the secondaries they hang up slightly due to the vacuum signal through the carb? Shut the car off and spring tension is enough to pull them shut? Or even the secondary air flaps?
After this occurs, can you shut the engine down then re-fire it within seconds and it will return to its lower idle?
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1977 Trans Am 400/4speed (swap)
Brian
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