Brera 2.4 20v engine cut out.
Got a very specific issue that is very frustrating:- 2.4 20v 210 brera 2008 which keeps cutting out intermittently. Engine management light comes on and the car coasts to a stop. I have to try to restart and then hit stop . This releases the key to enable me to remove and restart car. Car then Runs fine until next cut out with engine management light on. The error codes relate to injector 3/4/5 problem and there is no consistent pattern it can be any of these.
Work completed so far to resolve :-
Checked wiring loom
New crank sensor
New rpm sensor
New injector no 5
Removed mangoletsi tuning box
Checked swirl test etc.
Just had a full service with cambelt change 59k but still have the issue. Considering egr and PDF delete and remap but want to sort this issue first. Spent a small fortune trying to resolve this but to no avail.
I would really appreciate some considered views on what issue might be, seems electrical to me as it runs fine in between problems.