i have a 96 ss, i put longtubes and no cats on it 3 months ago and had madz28 tune it. he tuned it for LTs no cats full boltons, deleted the egr and air. he also erged me to tune it for 1.6rr that i was planning on puting on the car so there would be no retune and said it would not make a dif. i have not yet put on the 1.6rr bc of this issue. i let my car sit for 1 month as i was out of town the first thing i did was take off my egr and block it off. after that it started throwing codes, i replaced the o2 sensors and it did not help. then i ordered real o2 exensions and acdelco 02s and the car ran fine. the codes are p0153, p0133, p0151, p0300, p01153, p0134, and p0174. after 5 days the codes are back?? but this time it only throws 133 and 153. i can reset the computer and they keep coming back, it has been 3 sets of o2s, what else can it be????????? ion that tuned it said my pcm could be bad?? anything else you all can think of??????? i had 2 good months out of this why now?

p0153- bank 2 sensor 1 slow response
p0133- bank 1 sensor 1 slow response
p0151- abdk 2 sensor 1 low voltage
p0300- random mis
p1153- o2 sensor low switching bank 2 sensor 1
p0134- no activity detected
p0174- system too lean bank 2 sensor 1

 

nothing guys?