Car stops running after driving a few minutes. After turning off ignition will start and run a few more minutes. Mechanic has worked on it 3 days. Replaced ignition switch and I don't know what else. Any help would be dearly appreciated

 

Post moved and re-titled for better response.

When engine quits, try starting w/ 5 secs of throttle body cleaner into air intake.

If car starts briefly, then problem is fuel delivery; fuel pump, main fuel relay, wiring fault.

If car still does not start, then ignition problem; ignitor, rotor, wiring, crankshaft position sensor.

good luck