POS hyundai problems

[Adon VP]

A female friend of mine has a 2000 model+ hyundai accent.

She says that after 10minutes of driving it, the cars becomes jerky and wants to stall if you go under 20km/h or turn slowly around corners. Apparently a mechanic has looked at it and he told them it was the fuel pump which he then replaced but to no change but i know of him being a shit mechanic.

My first thought was fuel system, injectors? Maybe even dodgey set of spark plugs/spark plug leads?

[strgas]

water in the fuel maybe ??? shitty fuel (safeway petrol )

[strgas]

find a good mechanic ??? not a dealership mechanic either $600 bucks spent at holden and three days later the VR V6 was still running shit fuel pump changed and they still couldnt figure it out , taken to ex-holden mechanic figured it out in 5 mins and fuel pressure reg was the problem replaced cost $126...