Ihave a 99 ls1 z28
when i first got the car a month agoi changed the plugs wires fuel filter put a k&n cold airfilter on it and changed theoil then went from there.

my check engine light is on,i got it read at auto zoneand it said failure over 80mph, low volts to knock 1 and 2,02 sensors bank 1 sensor 1, bank2 sensor 1both aboveconverters and it had low fuel pressure. i changed the fuel pump with a ac delco. that did not work soi took it to the dealer tohave them read it andsee what they thought.theyread the computerand said the computer was bad they was for surethat it was badi told them i did not think that was the problemthey changed it and it was not the problem light came back on this time
both driver side 02 sensors soi changed them. then it said both passenger 02s then i changed them got it reset came back on again so i got it read again it said both knocks changed them reset the computer again it came back on and said 02'sbank 1 sensor 1 and bank 1 sensor 2 and low volts to knock 1 and 2sensors.I dont know what to do. All changes I have done myself butchanging thecomputer

 

well im not a genius at electronics in these newer cars but have u took time to see if u have power to the sensors that read bad.?
or u might have something grounding out so they read bad