stalls constantly.
 

after having a head rebuild, on my s3 4.2, I'm experiencing some new issues. whilst driving along, the engine stalls. when I try to start the car straight away, it won't fire. however if I let it sit for 5 minutes, it starts no problem.*
what have I bloody done?

Sounds like ignition amp on front of engine rhs above water pump. Can install new module inside it.