how we all doing

got a small prob with my au2 futura

its dual fuel, the car is having problems running in pertol, runs gr8 on gas thank god!!!!!. when i want it to run on petrol it stalls. it only stalls and splutters when i take off. when im driving at around 80 -100km hr and switch it from gas to petrol it runs fine.

i bought a fuel filter and injector cleaner but havent had a chance to install the new filter. would anyone know what is wrong or if it is common.

cheers peoples