Multiple CELs
 

So I purchased my car from a private dealer who didnt know much about what he was selling. After further inspection there is a 2.8 zzp pulley on it and has 60 lb injectors. I was receiving spark plug misfires, and bank 1 lean codes from the code reader. I did some research and dropped a heat level on my plugs from autolite AI3923 to XP3922. The codes are still showing up. Hasanyone run into this or have any suggestions on what to do in regards to it?

This is on a 2007 SS/SC.

First thing I would suggest is to try and figure out what the tune looks like. Who knows where fueling and spark are at. Is there an air/fuel ratio gauge?

there is no gauge but I think there is a slight leak in my flex pipe which I am looking to get fixed in the near future to see if that helps. What should the ratio look like? And if I were to ask a shop could they run it?

They could install an air/fuel ratio gauge and weld on the bung required on the down-pipe I would think but depends on the shop. Your air/fuel should be between 14.3-14.7 when idling and normal cruising conditions. Under WOT acceleration I think the standard target is about 11.5 for your setup but you won't be able to read that without adding a wideband sensor and gauge to display the signal.If your shop has HPTuners then they should be able to look at the tune configuration unless it has Trifecta. I know there was a factory "Stage 1" and "Stage 2" option which the dealer re-flashed the tune but I don't think any of those kits pullied down to 2.8 so you likely don't have that. Most likely, anyone with HPTuners should be able to help you out.