this is for a 97 TA, LT_Edit OBDII, auto, and a turbo with 3psi 'test' boost

I just got my car back together (finally) and I noticed the car is running a 11.5/12.5ish mixture during crusing (pretty much any RPM) and if i start boosting it'll stay steady at around 11.5 (sometimes 10, but thats just a tune issue which i'll figure out, another issue lol) and as soon as i let off, the AF goes to 15, then jumps to 18-22 and car starts popping and missing etc... then i'll give it gas again, and it'll jump to 14-18 and mis, pop again, and after couple quick touches to the gas, back to normal cruise it'll go back to 11.5...

what can this be?

i was thinking VE tables for cruise, but why does it go REAL lean when i'm giving no gas at all? or when i give it gas after it goes lean...

anyone?

PS: my rear o2 sensors have this constant problem where 'they' dont work very well... i'm on my 2nd set, and they work like crap... it might be the harness, i'm not sure but like i said they dont work too well... I was thinking this might be it, but i do know that it was never doing this problem BEFORE the new motor, with the turbo, or without the turbo...

 

nobody has a clue?