Hi i have a mk2 vw polo coupe 1.0l. it started cutting out on me as if im running out of petrol and it wont start for a while after. After the first time it would happen every time i went out and is undriveable. It will run on tick over for about 15 mins then it seems the fuel stops going into the injection unit. there is sparks and they choke is fine. Spark plugs and leads are fine. Ive replaced the distributor and the main electronick fuel pump.We are now out of ideas of what it could be and wonderd if you may be able to help?