Well, when you hit the gas and let off the throttle, the butterfly would close all the way and the car would stall out. The dashpot keeps it from completely closing too fast, thus eliminating stalling the engine.
The dash pot serves one purpose....to lower emmision levels when the throttle is closed suddenly. It keeps it open for a second, and slowly lets it close. You can eliminate it if you wish. But keep it in case you need it for a smog test.
Our cars are so old, that only a very bright technician would know its missing.
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