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Hello, my name is***** common things to cause this are weak battery, dirty throttle body, failing idle air control valve, and crankshaft position sensor. Start by having battery tested which you can do for free at your local parts store. If that doesn't help clean out throttle body and idle air control valve with a rag and throttle body cleaner. If problem still isn't any better then replace the crankshaft position sensor. Let me know how it goes or if you have more questions, thanks.