VN SS V8 fault codes 41 and 42?

[VNSV6]

Cuts out randomly, changed module but not sure if its ok still, still cuts out and dosnt start for 10-15mins. Engine light came on so i checked the codes and its coming up 41 first and 42. what is the problem? how can i fix it?

 

[Morton]

Is it a brand new ignition module?

When the car is dead and doesn't start, establish if the car has spark (screwdriver up the coil lead, near the engine body, and then on individual spark leads)
If spark is good, check if you're getting ignition pulse. Remove an injector plug and stick a parker globe in there and crank it. If it doesn't flash, you don't have ignition pulse.
If pulse is good, undo the inlet fuel line and see if you're getting fuel pressure when the car isn't starting.

If you have spark and fuel, go and buy a compression tester