Hi,
It could be caused by several things. The car's idle is controlled by the Idle air Control Valve (IAC). That is its only purpose. However it does nothing for the engine after an idle. If the car seems to respond worse over bumps, it sounds more like an electrical problem. Something could be loosing contact when moved.
I would first try to check grounds, and other wiring. Make sure everything is clean and tight.
Let me know what you find.
Joe
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Thursday, July 1st, 2021 AT 10:54 AM