ok....all my trouble comes from my o2 sensors....guess cleaning them wasn't enough.......also what is code 543 exactly???? it says fuel pump secondary circuit open, pcm to battery....what does that mean????
That's new to me. The only method I've ever heard of working is heating the sensor to clean it off. This can be done by removing the sensor and hitting it with a torch, or (in the older days), by introducing a huge vac leak. This would heat EGT's up and help burn deposits off the Lambda sensor.
You can check them for switching and amplitude (seeing it range from ~0.1-1.0 volts, a couple times a second).