Polo gti epc light :/

[Jonny p 9n3]

Hey guys I have a polo gti 9n3 and its not idling correctly and has brought the epc light on and the engine management light and sometimes the traction control light bt when the epc light is on there is a massive drop in power like the car is In some kind of limp mode I have googled it and it has brought back a variety of answers such as the maf sensor ,throttle sensor, egr valve and somebody mention something about the release bearing which I find hard to believe bt I have no idea what It could be so if anyone could shed some light on it or if anyone had has this problem I would grateful
Thanks
Jonny