Error 41 check engine light. Bad Cam sensor. What does magnet look like?

It hesitates and runs rough when starting from a stop. It also has stalled a couple of times. The engine shuts down and will not start. It will then start up later when the engine cools down.

Needs to be checked while it wont start. Parts that MIGHT be at falt are too pricy just to throw on it. Ignition module, coil pack, crank sensor or mas air flow sensor among other things as well. Simple test is when it stalls check for ignition fire, if ok most likely the mass air flow sensor on this engine!!!! ...........CAM SENSORS give 'very' little trouble!