Hi, I have a seat Leon cupra 07 and this only happens occasionally but when I come to a stop with clutch down my engine dies. It idles about 750 revs, when I come to a stop it goes to about 500 and jumps back up regularly but occasionally dies. I’ve checked all fuses, earths etc and nothing has worked. The only things I’ve done to the car was cam follower for fuel pump, forge spacer(dump valve) and it came with a cone filter attached to the old air box. I have no idea what the problem is. I plugged a scanner in and it comes up with various codes like ecm relay which I changed but still nothing. Any help would be much appreciated. Thanks