It the throttle plate closing all the way when the throttle is released? Is there the appropriate amount of slack in the throttle cable?
Run an unlit propane torch or spray carb cleaner along the flange unions of all of the intake components while the car is idling. When it buckles/hiccups you've found a leak. BE CAREFUL!!!!
You should also pull the idle speed control valve and make sure it's clean without obstruction.
How is the car's idle?
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