No, it's not acting right. When my engine is warm and the idle adjustment knob is set properly, the revs drop like a stone. Get the engine warm, open the hood and play with the linkage while it is running to see what is going on in there. Sounds like it is hanging up on something.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References