Yes, turn samples up to the max with max screens. Then, depending on the signal frequency, you can probably put a lot more time on each screen.
You can also set a trigger for a signal you know is failing, or will fail when the engine stalls. This way data collection will stop when the signal fails. Then you can simply scroll back through the screens in the buffer and see what happened.
Without trigger, the scope will continue to collect screens after the failure and, if you don't notice that the vehicle has died for a while, the failure data will scroll out of the buffer.
THE PicoScope Automotive Authority
In North America