Could anyone out there help me with this problem ??
I recently had a new(after market) fuel pump installed in my '93 Taurus
wagon 3.8 litre engine. I did'nt get 12 miles out of the repair shop and
the CHECK ENGINE light came on. By the time I drove back to the shop it
was closed for the 4th of july weekend. A friend had an engine diagnostic
device and read the codes for me. Codes 326,327, and 336,337 came up.
326 = EGR (PFE/DPFE)circuit voltage lower than expected
327 = EGR (EGRP/EVP/PFE/DPFE) circuit below minimum voltage.
 336 = Exhaust pressure high EGR (PFE/DPFE)circuit voltage higher than
expected.
 337 = EGR (EGRP/PFE/DPFE) circuit above maxamin voltage.
What does this all mean ??? What parts do I need ???  all help deeply
appreciated.

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