For the past while my car hasn't been running to great. It use to bogg in almost every gear if i put a little pedal to the metal..... So i tried everything I can do myself.. Changed all the spark plugs, changed the 4 coil packs... changed my filter to a cone... cleaned my MAF sensor....even changed the the plug to the MAF.. still ran a little off but it deff ran a little better. After i spoke to my friends dad someone who knows alot about cars he told me to change my fuel filter which i did... also helped but now when im already driving and i step on it, it will always shake and lag then boost hard. Also first gear boost fully but i doesnt have any power its werid Can anyone help meee

 

how much did it improve with all those mods, you make it sound like it did a lot and that is hard to diagnose. turbo cars have lag if you punch it off low RPM so that might be a problem. if that is not the case them i would blame it on a boost leak. for example if you are at 3000 rpm and you punch it it shouldnt lag if it does then it could be a boost leak from a hose or from a bad Diverter valve. that is my only valid diagnosis for power loss. there are few thing that will make you loose a lot of power when gunning it.

 

You need a VAGCOM to properly diagnose your problem.