Out of ideas all that is left is PCM not sure if Borgwarner coils make a difference but some cars are real OEM needy.
Looking through TSB found one on Code P1320
Bulliten ITB01-053 Date September 10, 2001 says if wiring checks out then replace coils with
RH side 22448-31U01 or 22448-31U11
LH side 22448-31U06 or 22448-31U16
Hope this helps
Thursday, May 28th, 2009 AT 12:13 PM