2-3 tries to start...

Recently put all new injectors in to solve a misfire problem: solved it, truck is running great.
Here's the thing: prior to the new injectors, the truck fired up on the first turn of the key; after the injectors, it now takes 2-3 tries about 50% of the time...IAC? Fuel pressure regulator?

 

Sounds like air in the line to me.... maybe you have a leak somewhere or something wasn't installed 100% right.

 

Go back and check everything that you would have taken off. Something might not be plug in, or fasten correctly. You might have a air leak or a pressure leak....... If you have it running and you turn off the key, then start it again within a couple seconds, do you still have trouble getting it to fire??? Try it a few times one right after another and see if you get the same results.