Crazy Misfires on 1,3,5,7

[Goliath23]

About a week ago my 2004 Yukon Denali started misfiring on 1,3,5 and 7 and then I unplugged my 02s on passenger side and drove perfectly fine. Replaced all 02s and drove fine for a night then back to crazy misfiring and now unplugged all 4 and it drives like nothing is wrong.......sooooooo lost!

 

[B-train]

1. Any OBD2 vehicle will default to baseline calibrations when a particular sensor is "unavailable" (O2, MAF, etc) and set a light
2. Did you use OEM sensors?
3. Are the correct sensors in the correct locations?
4. Can you watch live data for fuel trims with a scanner when running?

 

[Goliath23]

1. Any OBD2 vehicle will default to baseline calibrations when a particular sensor is "unavailable" (O2, MAF, etc) and set a light
2. Did you use OEM sensors?
3. Are the correct sensors in the correct locations?
4. Can you watch live data for fuel trims with a scanner when running?

These Sensors were in for 2yrs from auto parts store. Yeah live data have those misfiring close to 500 times each. Then unplugged them and no misfires on 1,3,5,7 and then it moved slight misfiring on 6 and 8. That's why me and my mechanic are so confused

 

[nonickatall]

Does your car have a high oil consumption?

And are you sure you are using the correct O2 sensors? You have four sensors, two on each bank. One before the cat is the relevant O2 sensor and another after the cat is for diagnostic purposes only. It has no effect on engine operation... The sensors are different and must not be mixed up

Also, if you disconnect the O2 sensor, the ECM will use stored default data.

So it is also possible that you have problems with another sensor, such as the mass air flow sensor, or the engine coolant temperature sensor, which disappears due to limp mode when you disconnect the O2 sensor...

Your mechanic will need to read live data and look for any unusual sensor data.