Hello everyone,
Im new to the forums so its nice to meet all of you! Hopefully someone can shed some light on my problem ive been having for months. I have the 2.3l engine with 60k miles on it, when I try to start the truck it will crank, turn over, get up to about 500 rpm and die. If i give it gas while turning over then it will start sometimes, rev up to 1500-2000 rpm and come down to around 800-900 rpm and be totally fine. Like I said before, this works 50% of the time.

When the truck is running, its perfect. Im not getting any problems idling or accelerating, changing gears.. nothin. Its only the initial starting process. I recently did some maintenance on the truck that had no affect on the starting process. Heres a list of things ive replaced or checked.

Replaced:
Air filter
Fuel filter
Spark Plugs and Wireset
Battery
Battery terminals
Fuel relay
Put injector cleaner in the tank
Cleaned the Maf sensor, IAC, TPS, throttle body

Checked the fuel pressure and primed its around 25psi, with the truck running its around 60 psi. If i prime the pump more than once itll go up to 50-60 psi and slowly creep back down to around 25psi. Is this normal?

Ive read that it could be my IAC is going out, but at this point im stumped. im not getting any codes or pending codes to help me diagnose. Another thing i should point out is im in the northwest and right now the temperatures range from 25-50F. Any help would be greatly appreciated. Thank you.