Engine stutters and stalls

The relay is a real low failure item. What are hoping to do related to it? What tests have you done so far, such as reading fault codes, checking for spark and fuel pressure, etc, and what were the results? How long will the engine run and how long before it will restart again? Any chance heat is a factor, either outside air temperature or engine heat? The more of these things you can share, the faster we can figure out how to proceed.