have your mechainc connect a fuel pump pressure guage to the fuel rail and have you to drive it as normal. He should show you how to read the guage so that when it cuts off you can record its reading. This could be fuel related (among other things) and this give you a good starting point for further diagnosis.
Meanwhile have him to check the electrical connections at the battery/starter and ignition fuses.

Answered by freemba (expert)
524 answers provided

When engine stalled, did the dash indicator lights showed immediately?

Answered by KHLow2008 (expert)
39,900 answers provided

Could any of these be part of the issue?

Safety Recall: Ignition Switch
(Supersedes 02-031, dated August 2002)

BACKGROUND
Electrical contacts in the ignition switch can wear
prematurely due to high electrical current passing
through the switch. Worn-out ignition contacts could
cause the engine to stall without warning. Although the
engine will restart in most cases, a vehicle that stalls
while driving increases the risk of a crash.

or the Alternator?

Response from lneely
1 question asked

yes

Response from lneely
1 question asked

Our mechanic has has it for 2 days... he still can't figure out what is wrong with it. the dash indicator lights show up immediately when it shuts off.

Response from lneely
1 question asked

Yes, the ignition switch could be the cause of the problem but usually it would take a while for the dash indicators lights to come on. I would still advise getting it checked.

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Answered by KHLow2008 (expert)
39,900 answers provided