Linhai Bighorn 28 (400)

Starts ok and idles, however when I start to accelerate, it will accelerate for a few seconds then dies as if it has run out of fuel. I can keep it going by pulling the choke out while accelerating and driving by using the pedal and the choke at the same time adjusting both to keep it moving. When I stop accelerating, it will idle indefinitely without stalling.

Full tank of gas.

Any advice on what could be wrong and what I should be checking?
Thank you