Got some codes and need some help.
 

Hey there everyone this is my first blazer and i just got it from some kid and its all around a good truck just want to get everything right. It has 190k on it and runs a little rough, but need some help with these codes. P0133/P0134/P0135/P0300/P0325/P01133. Anyone got anything on these codes please let me know. Thanks

P0133 - HO2S Slow Response Bank 1 Sensor 1
P0134 - HO2S Circuit Insufficient Activity Bank 1 Sensor 1
P0135 - HO2S Heater Circuit Bank 1 Sensor 1
P030x - Random/Multiple Cylinder Misfire Detected
P0325 - Knock Sensor 1 Circuit Bank 1
P1133 - HO2S Insufficient Switching Bank 1 Sensor 1

The P0300 code is likely caused by the multitude of B1S1 codes. I would look for some commonality between the B1S1 O2 sensor codes and the KS code.

Ya man wanted to know how many O2 sensors i had in my 95 and how do i test them and the knock sensor what is that? and how do i test it or is this just replace the parts type of thing? please let me know