stalling unpredictably, restarts after sitting

the check engine light is not on, making the problem harder to diagnose as there are no codes. would the check engine light come on if the relay were bad? the car has been running for over an hour now and has not stalled out idling.

Relay failures will not trip a check engine light. Did you check the date on the fuel pump relay? You will need a Torx T25 to get to the relay.

Thanks for helping me find it. It is green not red with no date on it?

Green = Original.... old, replacing it would be the next step.

fuel pump was just replaced. where is the relay?

Thanks for all the help guys, the 103 relay solved the problem!!!