97 Blazer problems

Has a 4.3 that runs fine til it gets warmed up. Bogs down and SES light comes on.Took it to autozone, got the codes pulled and it said O2 sensors. Replaced both of them, still bogging down when trying to accelerate, but SES doesnt come on any more. It even backfired today. Just tuned it up, plugs, fuel filter, air filter 2 months ago. Any ideas ? Thanks in advance.

Has a 4.3 that runs fine til it gets warmed up. Bogs down and SES light comes on.Took it to autozone, got the codes pulled and it said O2 sensors. Replaced both of them, still bogging down when trying to accelerate, but SES doesnt come on any more. It even backfired today. Just tuned it up, plugs, fuel filter, air filter 2 months ago. Any ideas ? Thanks in advance.

There are about 6 different codes for the O2 sensors..not all the codes require replacement.
Depending on the code, you may have a lean condition causing your problem