Need help with some codes I pulled

[ivan12]

KOEO:
542 - Fuel pump secondary circuit fault
327 - EGR valve positioning circuit below voltage (I deleted the EGR so I know why it's pulling the code)

KOER:
327 - *
543 - Fuel pump secondary circuit fault
137 - system rich on one side

I guess the ones I need help with are 542 and 543. What could be causing this? I pulled the codes because the car has been running like poo lately. Itsmissing and backfiring pretty bad.

 

[Addermk2]

IIRC, the 542 and 543 codes are CCRM related.

as for the 137, swap your O2 sensors from one side to the other, clear codes and drive around a bit. If the code switches to another bank. its an O2 problem.... in which case you should replace both.

 

[CC'S95GT]

the 542 and 543 codes could also be caused from the PIP in the dizzy going bad and giving the FP intermitant signals.
And also causing the car to back backfire and run like poo.
ck the dizzy

 

[ivan12]

The dizzy was my first guess so I replaced it with a piece from advanced auto, didn't help one bit