What are the current temps when this occurs?
Mine " when I had a grid heater " would not have an issue starting even when we we're in the mid 20's for a week.
After I got rid of the grid heater, on a similar degree outside it'll hesitate a tad bit but clears right out when it fires over fully.
This would only be on initial cold start in the mornings or if I let it sit for several hours and it's still really cold out.
That's why I mentioned plugging the truck in on the block heater to try and rule out that possibility.
As you mentioned, with your grid heater working it reduces symptoms makes me lean more towards the cold climate you might be in.
I don't recall the Fahrenheit the grid begins to physically cycle.
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