2000 Grand Am stalls

Happened 3 times since to my son since buying 3 months ago. Happened all 3 times when the turn signal was on and turning or about to turn. Anyone have any ideas?

what engine ?
when was the last tune up ??
Is the power steering making any noise ?

what engine ?
when was the last tune up ??
Is the power steering making any noise ?
Its a 4 cyl.
What does a tune up have to do with a car stalling when the signal goes on?

I wouldnt think the signal is the problem, more like when the wheel is turned causing pull on the engine.

But typicaly stalls are caused by;
faulty IAC,
clogged fuel filter,
wet or damaged ignition componets,
faulty plugs,
vacum leaks on the intake or hoses.