Misfire 1.8T 20v Help please.

Hi,

I have a AGU with Qpeng ECU.  Car starts fine but when you blip the throttle there is a slight misfire then it picks up and revs normal.  Does not mis if you pull off then dip it again, so only from idle.

Seems worse when cold.

Really annoying, done it since day one, had it re-mapped and still no good.

Checked all pipes ect, all seem fine.

Running standard Gti fuel pump which I am told if up to the task.  

Any ideas?

Help mucho appreciated guys as always.

i had a miss fire on my AGU mkIV,  drove me mad changed everything electrical, turned out the pipe had come off the inter cooler ever so slightly causing a pressure leak, was fine after that.