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I am sorry for publishing on the ford probe site.
But I could not get any help on the mx6.com forum.

Alright it is been a journey on this car, but I still need the help from the guru. So first let me do a review before diving in.

First of here are the specs on the car:
•1994 mazda mx-6 LS ( for the shell and interior) manual transmission
•Engine 2.5 L V6 from a ford probe GT, I think. On top of the headers, I can see FORD ( how can I know the Gen )

When I first got the car, I had the following behaviors:
•Rough idle
•I could not get passed 75 miles per hour and losing power. I had to constantly downshift
•Very bad fuel efficiency no more than 18mpg.

I ran a diagnostic and got the following codes: 15,16,17,18,23,41,42.

What I have done:
• Replaced O2 sensor upstream ( driver side)
• Replaced O2 sensor downstream ( passenger side)
• Replaced VRIS 1 and 2
• Installed fuel pressure regulator solenoid( it was missing)
• Replaced the spark plug and wire set
• Replaced distributor cap

After those replacements, I ran another diagnostic and got 15, 16, 17. The car was doing better.
My fuel efficiency was 25.6 mpg. Then the rough idle came back so as loss of power.
I ran another diagnostic: 15,16,17,8,5. 8 and 5 were new (I think there are related to MAF sensor and knock sensor).

What I have done again:
•Adjusted the Idle Air Control, since while idling the rpm dropped to 500 with the car acting like it was going to shut down.
o Adjusted to IAC until Rpm stayed around 900rpm during idle.
•While the car was running, I tried to unplug the spark plug wires on the front (2, 4, 6). During that the engine behavior was not getting worse, no change whatsoever.
oReplaced again the spark plug wire set, some would not go in easily. So I used electrical tape to close the gap between distributor cap and boot from the wire

Results:
The car is running better, but loses panache when outside temperature is scorching hot. After running another diagnostic, I am still getting 15, 16, 17.

the questions and helps
1. EGR
I know that 16 is related to the EGR. As stated in previous post, the previous owner attempted to do a delete. But quite frankly, it is obnoxious to have your clothes smelling like carbon. So I want to put the EGR on it, unfortunately I cannot find a well detailed vacuum diagram. I have used so far:
• Repairsurgemanual
• Alldatadiy
• Autozone
Any pointer like a well detail diagram or a step by steps video?

2. Code 15 and 17
After changing the O2 sensor twice, I am starting to believe that the problem lays in the PCM/ECU.
Mine has the following info( I will try to mimic the bar code) on it :
3 KL55B
KL55
EGI
KLL55 18 881B
TN079700-4392

Question
1. What are the year make and model that will be compatible with 94 mx-6 MTX for a PCM/ECU swap?
2. I noticed that the intake air system is after market. It looks like a MAF from Duralast. Will that means that I need to a do MAF swap?
3. What is a MAF swap and how to do it? ( a step by step guide will be so awesome)

I know that it is a long post but some guidance are much needed.
 

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I looked up the part numbers for the 94 Probe EU and the 94 MX6 ECU, they're not the same. From what I can see, the only compatible ECU's are the 94 MX6 and the 94 and 95 626. I don't know if there's that muchof a difference between the Probe and the MX6, but it's a potential start.
 

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I have a 95 PGT, not sure of the year of your 2.5 KLDE but I do have the 95 Ford Probe service and wiring manual. also a spare EGR valve assembly. These are some of the vacuum diagrams I have.

142-1 Vac.jpg
142-2 Vac.jpg
03vac.jpg
EGR Drawing.png
Vacuum Chambers.jpg
 
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