Car stalls

Car is a little slow starting in the morning. But on occasionally it will stumble and shut off. It did get a check engine light once. The Ford dealer told me it was the pressure switch on the fuel rail. I changed that still have the same problem. A private owned shopped looked at did scans, drove hooked up to a laptop couldn't find any problem. When it shuts off in just a few minutes it will fire back up and drive fine. On the couple of accusation it light the light. After driving it the light resets.