Are you saying the rubber dust cover on the right hand(passenger side) mount is flappy? They are like they from new. These are 3 cylinder engines. They vibrate and shake at idle. If you don’t secure the snorkel early on it’ll wear out. Do a search. The engine rocks back and forth when shifting between drive and reverse.
It might be worth removing the lower mount snd checking for debris in the subframe, I’ve seen gravel stuck in behind causing a bad vibration/noise when on the throttle.
I saw a video on you tube with some hillbillies crying that their new mirage engine shook at idle so it was broken. I thought it was a joke but they were just touched.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)