Manufaturer specific code P1153

1996 chevy blazer 4.3 vortec, I know its a switching problem between the heated oxygen sensors, and that it is bank 2 sensor 1, causeing the problem, changed it to new changed all to new actually, reset ecm, light comes back on, upon researching the manufactureing codes I come up with p= powertrain 1=fuel and air metering 5=vehicle speed control, idle control 3=ignition system or misfire, I am at wits end, all connections are good, vehicle will hesitate upon normal driving at a steady speed rpms jump up and down not drasticlly but enough to know its there, so any ideas what is causeing this malfunction.