A7 Non Starter issues

[Carling1256]

Hi guys, 

I’m after some advice as a new member,  back in Jan/Feb this year I got my car re-mapped (😒) stage1 De-Cat, DPF Delete, EGR,  few weeks later car started to produce small black smoke which is it be expected with the de-cat & DPF delete,  then as time went on few weeks past a lot of thick black smoke then the car cut out,  since then we’ve been unable to get it running again,  NO Codes from the ECU at all, we have drained the fuel out of the car and put new fuel in due to the car being sat for (5 months) due to be working abroad,  came back started working on the car again, finally got it started and got this (pic below) soon as you take you’re foot off the accelerator she dies again. 

some say ECU issues, Fuel Filter issues 

2012 plate, Full service history, 173,000 👀 (motorway mileage) 

any suggestions on where to go from here as I’m not fully upto speed on the mechanical side.