Stuttering and sometimes stalling - not smooth when moving.

I have a k11.

Lately, once warm and sitting at lights, my engine starts stuttering and sometimes even stalls. It is worse when facing downhill.

Also, when driving along at a steady speed, i can feel the car struggling a bit.

I think its a fuelling issue, but no ideal where to strat looking to find and eventually fix the fault.

The last thing i did was an oil and filter change, but i dont think that has much to do with it. (although it did strat happening two days after i did it.
 
Throttle body air flow sensor issue I would say. When the car starts doing this unplug the sensor if it settles and idles then that is your issue. Although you can't really drive it whilst unplugged its just for a test.
 
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