Question about 2004 Mercury Sable

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My 2004 Sable hesitates and also jumps down to low rpm at idle. I started seeing this the day after I did my oil change with non-dealer mechanic. The technician did not close the oil cap(!) after changing the oil and I drove a mile before I found something was wrong. The mechanic topped off oil and degreased. Do you think this is causing any of my current issue?

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