Need help for odd problem

[notrun58]

Hi New to this site. I have a 97 Ranger 4x4 4.0 Automatic Parked it one day running fine. The next day runs terrible.
Running a key on/engine running test shows all o2 sensor readings at 0.0000 volt. All fuel trims are at -100.0 and never changes. I get 10-11 mpg.But it never shows trouble codes. it spits and pops and bucks when cold and is gutless at all times. But no codes.
Fuse isnt blown. Wiring I can get to looks OK. Dont know what to try next. Any ideas would be greatly appreciated

 

[SenorNoob]

I can't see how all O2 sensors read 0v unless something wrong with wring or ECU. Also with that you should have codes. Makes me think the ECU is problematic.

 

[notrun58]

Should have put in that I replaced the ecu. No change

 

[SenorNoob]

In that case, what does your wiring look like. Any chance a connector underhood has come unplugged?

 

[notrun58]

Not that I've been abkle to spot. Working outside and we've had snoww on the ground for awhile. Cant see anything underhood coming loose so I'm gonna climb under and try to follow wiring to O2 sensors. Strange it showed up while parked overnight.

 

[19Walt93]

Might be worth checking the O2 grounds.