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Hi my name is Robert....
I see no other experts have responded.... To start off on this I would verify the battery voltage when the engine is cranking over, make sure the voltage is not going under 10 volts when cranking, check all the cables make sure they are clean and tight and the main ground is tight, if you had a loose cable it could give intermittent issues.
IF it is not a voltage issue it could be an issue with the fuel delivery, IF the fuel filter has not been changed in some time I might change that out to see if it helps. The fuel pump also could be giving you intermittent problems as well. I might have a shop have another look at this if the problem continues.