94 4x4 check engine light

I have a 94 explorer sport 4x4 5spd, 4.0.

The check engine light is on. I went to the tech library and found the procedure for reading the codes.

I got a code of 335 - (O) EGR feedback signal is/was out of range - EVR or PFE

and a code of 522 - (O) Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault - PNP transmission MLP sensor out of range in park - Transmissions

Where do I go from here?

Thanks for any help.

I found the problem with the 522 code...I didn't have the tranny in neutral when I checked the codes.

I did come up with another code though, a 332 - which is "EGR did not open/respond during test or if memory code, did not open intermittantly - EVR or PFE"

any ideas?

i think its the egr valve, iv got a 99 f-150 that had the same readings and being a past mechanic discovered the egr valve was malfunctioning, check it and let me know what happens