My Tribute stalls while driving. No rhyme or reason, just sputters then dies. No Check Engine light on. Car will often start right up again but not always right away. My mechanic wants to wait to duplicate this, so he's driving around with my car, which is nuts.
What should be first things to address and in what order? Thanks.

 

Ask your Mechanic !

Seriously you have taken it to your personal mechanic and now ask here as if your mechanic does not know eff all , yet you do or want too