codes, codes, codes!

ThunderSC1994

Registered User
I pulled the codes on my 94 SC today. Here is what i got:
337 EGR (EVP/PFE/DPFE) Signal to hi
126 MAP, Baro out of range
172 EGO not switching Lean exh (bank 1)
336 Exh press high or EGR (PFE) signal hi

Does anyone know what's going on
 
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