Hi Glyno, don’t think it’s a problem at all, I imagine the engine is just running like that to drive the compressor………..I’ve had 3 120’s as well and they all do the same thing as I remember.
Normal operation is to 'idle up' which simply gives the engine a little more fuel to stop it stalling and cope with the load of the AC compressor. So what you report is perfectly normal by the sound of it.
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