That is something I would try, but use Techron.
I was experiencing sort of the same problem, cleaned the Idle control Valve (thoroughly) ran Techron (big bottle) went to Asheville, and problem disappeared. Try to run the Techron right before an oil change.
I see you are at the RTP. I am in Clayton, NC.

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
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