For the last while I while driving I have a random missfire and my O2 sensors quit and fuel milage is gone. Tested 02s and they are ok. Injectors are ok. But when trying to use a scan tool I loose my signals from O2s, temp, timing, coolant temp and so on. Yesterday I drove to Bradford and ran good with good fuel milage. Running Shell 93. But coming home it used almost a half tank of fuel. It is about 80kms each way. The sound of the motor sounds like it is at base timing and labouring. I did have a bad EGR which I changed and ran good for about 200kms and now back to sucking fuel.
Could this say my PCM is on the way out?
At a loss here on what to look for. Any help would be great.
Thanks