Peugeot 407 problem starting and cutting out

Changed abs sensors on car and put genuine ones on as abs light was on and next day engine management light, depollution system faulty and esp/asr all on dash. Car struggles to start then drives fine until it decides to cut out which isn't safe on the roads and can take up to 5 turns for engine to start again. I took it on a short journey yesterday to test it as i had my ecu returned and it cut out 10 times. Peugeot did diagnostic and got codes PO351 and PO352 - intermittent fault 1and 2 ignition coil short circuit to positive. Peugeot don't know what's wrong so suggested coil pack which didn't cure it then ecu which i sent away and it has no fault. I have had it in 4 garages in total including an autoelectrician who tested wiring to coil pack which is fine. No one knows what the problem is. The car has had full service and passed its mot 5 weeks ago. Can anyone help. I have thrown money at the car and got nowhere.