Issue with car rev'ing and brake!

Question

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 :)

Thanks.

Edward Evans · Answer

you didn't give much information on the engine type size if turbo or not...if its the turbo model sounds like the pressure pipe is loose or needs to be replaced...and yes i have known a problem just as you describe and that was the problem ..if you can give more information it would help me help you

Answered by Edward Evans on January 20, 2021

Shuyaib Abdullah · Answer

Could be the fuel pump. When you press the pedal thats when the throttle opens up and the fuel pump should supply the fuel according to the pedal, more fuel in less pedal would make the engine stop, more pedal in less fuel will make the engine stop as well. Could also be the fuel lines.

Answered by Shuyaib Abdullah on January 20, 2021

Issue with car rev'ing and brake!

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