K11 pre-facelift running putt, putt, putt,

Just when I get 1 of my Micra's running ok, the other one just suddenly starts playing up.

Running fine, going to and from work, then all of a sudden running like loss of power and putt, putt putt effect from the exhaust, like it's missing. I have re-solded the TB earlier in the year.
The idle is fine at 750-850, I can't upload a video.
I recently replaced the TB on my other pre face lift and runs fine now, I'm wondering if my other one too requires TB replacing?
 
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