CEL Light....code P0171...HELP

[SVT1996Cobra]

hello all,

well, i was driving normally today and my CEL came on, i got it scanned at AutoZone ASAP and it came back with 2 codes, both P0171 (system too lean Bank 1).

My exhaust consists of stock headers, MAC O/R H-Pipe, MILs, Flowmaster 2 chambers, cutoff after muffler.

I had this code right after i installed the H-pipe around 7 months ago. I replaced ALL 4 of the O2s with Bousch sensors ( i know, i didn't have to replace the back 2.....). The light still came on even after the O2s. I cleaned the fuel system with a off the shelve cleaner with no luck, i then replaced the fuel filter and it went away.......now it's back....7 months later! Anyone know whats going on?

Thanks,
Jason

 

[SVT1996Cobra]

anyone? i think it's weird how the same code is thrown twice....

btw, i don't hear any unusual noises from the motor (not an expert on detenation here...), but my idle has become kinda unstable.....

 

[96SVT_2_NV]

sorry no info on the code, but i threw a P1443 twice too, id like to know if thats normal also