Couple of other things.
1. The cool thing about the fuel injected LS engines is if everything is hooked correctly as soon as it has fuel pressure to the injectors it will fire up and run. No messing with timing and such. I like to have the car on jack stands so you can run it slowly thru gears off the ground for the first time.
2. As it warms up check for coolant flow. Sometimes you need to open up the coolant crossover to let some trapped air out.
3. If this is a drive by cable and you have a bigger cam you might have to open up throttle blade a bit to get it to idle.
I've done a half a dozen new LS start-ups. Just primed with the starter with the power to the computer off. Never had a lick of trouble.
Good luck.
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