My 16v golf is currently being moted, before it went in it was flat as a fart idle was smooth but as soon as you put your foot down it spluttered and did nt really go any faster, if you feathered the throttle it would pick up speed. They have changed the noisey fuel pump and checked the timing, when on the gas analyser it goes really weak as soon as any throttle is applied? There going to change the fuel filter next, then possible injectors? Any ideas can't early find much via the search option. Any ideas