OK you are all about to see me on the NEWS..... $800 New Cat, New Muffler, New o'2 sensors and the truck is still backfireing.. I get code P0132 and Cylinder 3 and 5 are misfireing... Im $800 in and back at square one... YESSSSS! Any suggestions Please?

 

You never said anything about cylinders 3 and 5 misfiring in your original post, thats probley whats causing your backfiring issues.

 

ok P0132 is still pulling up, I replaced my Cat, I replaced my muffler, and I put in 2 bosh O2 sensors. $800. in and im still having the same problem, ALTHOUGH cylinder 3 and 5 are missing, so any suggestions????? Im about to go postal!