Does it stay there while cranking? while the engine runs for few seconds??

Any kind of security system on the truck?

 

Stays solid at 48.
The truck has the power and security package, power locks, security alarm, etc.

 

Wonder if you are having an alarm problem? Is there a security light in the dash? Is it doing anything?

 

There is a security light on the dash. When I turn the key to the on position, the security light turns on, but shuts off after a few seconds.

 

Ok, that's the way it is supposed to work..... But it still sounds like a security issue.... Do you have a black, or grey key?

 

My truck has a black key.

 

That's odd..... With the security system, it should be a gray key..... At least, that's what I thought........ (not like I haven't been wrong before.... )

Ok, going back thru the thread, this is a 5.2, right? If that's the case, I think your one connector you show in the pic, up by the throttle body, appears to be the MAP sensor..... not gonna run real well without that.

 

So I just checked, map sensor seems to be plugged in.

 

What is the other one layin' there go to then?

 

On the right of the throttle body? No idea. On the left near the alternator? Also no idea lol. I'm at a loss here man. I don't know if it's just me, but these wires look too clean to be a factory unplugged wire, like an ABS wire or something, so I think that might have something to do with the issue, I'm going to see if I can find a wiring diagram that locates these wires and says what they are for.