Answers: It's normal.
There is a A/C accentuation solenoid that should certainly help boost the RPM's when the A/C is on as it puts a huge nouns on the engine and smaller ones show this by dropping a few RPM's
if ti wants to die next the solenoid may be bad or disconnected.
If you hold the A/C on and hit the gas like on an onramp you will be aware of the A/C kick out to administer you the power you have requested.
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