Fluctuating RPM

Hi there,

I have been witnessing fluctuating RPM since 4 months now on my 2019 CX9 that has 130k on the clock. The RPM keeps on going down then back to normal occasionally. I replaced sparking plugs, air filter and fuel filter. I'm thinking to reach out to the throttle and clean. Before I do so, has anyone gone through the same symptoms? If yes , what was the solution.

Thank you,
 
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