All O2 sensors

[green]

Codes are PO131, PO137, PO151, PO157. They only happen when the RPM's get around 4000 and then the car runs like shit for 3 or 4 days. After which the SES goes out and it runs sort of normal until i push it and the cycle goes on. For about 3 months i have been dealing with this. Cleaned the MAF, new plugs and wires, changed fuel filter. MODS are a cat back Magnaflo and a SLP lid. I am pretty sure the SES was on before the mods i did not have a reader then. It is getting worse as time goes on. Any help would be apprechttp://www.ls1.com/forums/images/smilies/giveup.gifiated.

[DaddySS]

You've got codes for front and rear sensors, both sides indicating a lean condition. First, reset the PCM that will clear the codes and recent history. Then make sure you don't have any exhaust leaks that would be causing a bad reading.