I have 04 VW Polo, it's a bit a complicated for me to explain as I have limited knowledge of car terminology, and this issue happens frequently but not constantly. So, issue number 1 is while I may be driving, The accelerator pedal suddenly becomes very loose and if I press it all the way, the car won't speed up at all. This is usually at higher speeds only, such as 100 Km/hr.
Issue number 2 happens frequently as well and it is while I may be driving in traffic at lower speeds, the car revs up to 2000 rpm and then ''it feels'' to suddenly brakes and jerks once to slow it down. this happens every time I try to rev past 2000 rpm. If I move my foot of off the accelerator pedal, eng just dies. turning it back on fixes the issue for a little while and then comes back again.
I took the car to a mechanic and he said, fuel pump need be changed, however, looking at the issue, I don't see why the fuel pump will affect the car in this manner. Tried other mechanics and each had different answers. I have been researching this for the last 2 weeks and I have not found anyone who had a similar issue. Any help would be appreciated :)