You still have a vacuum leak. Your fuel trims are probably still high positive.

Do the 20 stomp to clear the memory then unplug your battery for 30 min.

Drive it a while and check fuel trims and g/sec. To see if it gets any better

 

I checked for leaks using smoke machines and pressure

 

Yeah i forgot . Did you clean the maf sensor? If you did the sensor might be bad.

Have you had a compression test?

 

I just saw you used another sensor and got the same g/sec so scratch the bad sensor.

 

I tried 4 sensors

1 - stock
2 - On the other mazda rx8
3 - On the other mazda 3
4 - new

 

When you used smoke, did the manifold hold any pressure? Did the motor turn from the pressure?

 

Yes, of course. I used smoke from the pressure.
Did the motor turn from the pressure? - Sorry, I don't understand this question.

 

How much pressure did you apply? I would use at least 10 psi.

 

25-35 psi

 

I do not know what else could be causing it to be low. But your fuel trim and maf work togther.

 

New CEL P0456
Most likely this gas cap.
Because this can be a P0171?