Hi, it's probably just a vaccum hose. There isnt really any way to tell which one without looking, but they are cheap. This is a very common complaint and has many causes. If your car has air conditioning, for instance, see if the problem occurs with the heater control switch in the off position (the AC cycles in the defrost and floor/defrost positions even if you don't specifically think that the AC is on.)
The oxygen sensor can also cause this when it is bad....
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