S3 cutting out at idle help!!!

magic123

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i have bought an 8p (56 plate) S3 about 4 days ago, sometimes the engine cuts out when its idling, but then restarts, cuts out and then same but doesnt cut out. It generally does it if ive say driven 20miles stop get out do some quick shopping, go to start it and it dies, it sounds a little lumpy the revs bounce a little then cuts out this is about 4-6secs it does this in, oils fine, its remapped, induction kit, forge dump valve, im so gutted :( any ideas? no EM lights or anything?! it seems fine on first start up pre driving?