Truck has troubles starting even when warm

[r_marczak_83]

My e99 has 270,000 miles on her. Last fall I replaced the GP's, GPR, and Batteries (just incase this matters). It is 80 degrees out and for about the last 4-5 months it doesn't want to start very good. It cranks for ever with no start. If I dont let off, it will run batteries down eventially. So I quit cranking after 10 seconds or so and hit it again and it starts up. It always starts on the second try. Why not right away on the first try though?