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If you also have a high idle (1500-1800 rpms) on startup and a hot idle in gear over 1000, you might check the base gasket under the throttle body. Spray some carb cleaner at the base gasket and see if the idle goes up more. I have never owned a TBI that didn't have this go bad at some point. Cheap fix. Sounds like a bigger leak than just the gasket, though.
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