Had a call from my bro who is having a problem with his FRST. When driving along under normal conditions (i.e not ragging it) the engine keeps cutting out. We suspect that the car is losing its spark. He's convinced that it's the CPS that's at fault but I was always under the impression that these sensors either worked or didn't without middle ground.

Anybody got any ideas we can try to suss this out before it has to go in?

In advance