Just a guess ...

The ignition switch has wires that run down the steering column, when
turning left, the wires are able to break momentarily and shut the engine
down. The ignition switch provides electricity to the rest of the system,
and if the right wire was being chaffed somehow, or stretched, then the
electricity it provides can go away momentarily and kill the motor because
the computer that needs the electricity goes dead.

I would suggest that the lost signal would post to the on board computer,
even though there may not be a Check Engine light. You guys can go to
AutoZone and they will pull the engine codes for you free of charge, and see
if there are any codes that relate to lost power.

This is a much bigger longshot than Jeff's post, but bears telling
even if just for its peculiarity. My father had a work car that
started dying at a certain intersection. On realizing there was a huge
number of power lines there, he speculated that he may have spark plug
wires in bad enough shape that the magnetic field from the overhead
lines could be interacting with them and causing the stall. At home,
he started the car, popped the hood and wiggled and distorted spark
plug wires till he found some that were failing, causing a miss.
Whether his theory was the cause or a freakish coincidence, I don't
know, but he replaced the wires and didn't have the problem again.

Regarding engine codes, my Chilton's manual for my truck lists all the
codes and explains how to get the codes out of the computer yourself
with a ohmmeter. Good luck.

Matt