OK, UPDATE! found out that these "upgraded" 4-hole injectors are only 14lb injectors and need 22+lb.
So, now have to either go 'yardin' for another set or buy new/refurb'd.

Thank you guys again.

 

If it looks like this, that's not the pump.

 

Yes.. Correct. I thought that I took pictures on my phone. But I'll keep trying. It's got a few ports on it, but there's no reference on size, like a soda can or quarter..
But this brings up another question. So, these new injectors I got are only 14# and supposed to be at 22+.
Could that lean situation be tricking the other sensors into false positives? (just a thought)

 

hope I did everything right!

 

That looks about right.

 

IIRC the top is the purge solenoid and the bottom is the LDP.

And yes, getting half the fuel will cause a whole pile of other issues. Hopefully nothing is hurt from going that lean.

 

I've had a few of these 2.5's in Jeeps, and they're pretty tough. NOT a lot of hp, but would be perfect in a ol Willis army Jeep that doesn't see 60mph.
It wasn't run all that long. Maybe 7-10min.. I was hoping to find some local yards with the older '90's cars/trucks. But not seeing much according to the models that have the 4-hole injector that I'm looking for.
But I do have a couple older Dakota's with the 3.9's. Maybe I'll swipe some from them just to get her running, and see if the codes go away or change.
There are some Ford's that have 23-25#, but wonder will they run RICH only being 2-3# over my "stock" 22? Or will it compensate, and bring the temps down?

Again, thank you guys for your help. At 60 I'm still learning this injection stuff..

 

I'm not 100% sure but I would expect them to all (2.5/3.9/5.2/5.9) use the same injector for the sake of simplicity. Note that some will have the square EV1 connector and some will have the rounded rectangular EV6/USCAR connector. 2000 was the year split as with everything else. And yes, a friend of mine has an original M38 and he's rebuilt that engine a few times and it just does not die. Which is good because it's all army original, including the number plates riveted to the dash and painted on the hood.

 

Well, PRAISE THE LORD!!
Just like you said, I have a few 1st gens and pulled a few from a 94 5.2.
installed them and FIRED right up, but stayed at 12-1500rpms WITH NO CODES! Then 0505 (IAC) came back..
And intermittently comes and goes.
I did, (this time around) swap out to a 4.0 throttle body that I had, and swapped over. So with the idle up a bit, it may be the TPS and or IAC. I got some welding wire to stick down the tps plug to measure the voltage. Maybe it wasn't all the way to "closed" according to the ECU.(?) So going to loosen it and twist it with it running and see how if it changes.

But, PRAISE GOD GUYS!
IM MOTORVATING!

 

It's very possible, unlikely but possible, that there is a loose connection in the IAC motor wiring or that the motor itself is failing.

The IAC motors are bipolar steppers. There is not current/voltage on the wires most of the time.

https://www.electrical4u.com/bipolar-stepper-motor/