I think that would be a good first step. Take an hour or so and pull the plugs and see what they say. If everything is good there you can move on to other things. My next thought would be fuel somewhere. Maybe your pump is getting tired and it gets hot after a drive and doesn't want to build pressure. If you've got any way to check your fuel pressure that might be worth a check. Hope you get it figured out and it's something silly and easy dude
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