Carburated engine stumbles at low revolutions. Toyota Carina?

Sprinter

New member
Hello,
Its a toyota carina 1.6 4A Petrol Engine. The engine sounds smooth at idle, and runs smooth at high revolutions, but at low revolutions it stumbles and car starts jerking. I checked the float bowl, the fuel level was a bit low, I adjusted the float and now fuel level is ok (middle), but the car still jerks. I have cleaned up all the jets and stuff, but the problem persists.

Any suggestions will be greatly appreciated.
 
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