I have continually been getting code 213 & 225.

I buy a chilton manual and look over wiring. My harness does not match what is shown in book for the year. It does match that of 94-95. Color and pin location.

The 91 shows the knock sensor signal wire going to pin 6. Mine goes to pin 23 which matches the 94-95.

Could this be the problem? I have a 95 harness and a 91 PCM and certain things aren't jiving.?

 

That could be an issue. 94-95 5.0 was wired for MAF - single injector fire. 91 had speed density - 4 injectors at once. That would give you some drivability issues I would think.