K12 Throttle Valve Problems

2004 k12 1.2 16v petrol
My friends car ticks over ok when stationary then the revs drop and just as it is about to stall it recovers
Now she tells me it sometimes stalls when driving
She’s lost her handbook so all my information comes from web searches/forums/YouTube
It sounds like there’s a problem with the throttle valve
I intend to take it off and clean it to see if that resolves it before replacing it ( seems expensive)
My question is why are there no fault codes displayed on my Autel fault code reader?
Or can anyone suggest another fault
Thanks
 
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