Random/multiple misfires - 2015 Sedan V8 5.0, cyl 1,4,8

[Dtinnc]

Driving on the highway yesterday suddenly felt a change in power and made my way to the exit. Engine was running rough and pulsing a bit. A few miles later made it home and pulled codes.

P0300, P0301, P0308, P0304
The 300 code is the Random/Multiple misfire code and then cyl 1, 8 and 4.

Reset the ECL.

Started the car a few hours later and it sounded better. Have not driven so can't say the issue is gone.

I have read some about an Oil Control Valve etc. These cylinders are on both sides so ruling out issues that are on one side only. Coil packs would not fail like this. What's the likelihood of the ECU? And if so, do ECU issues go away or would they persist (some ppl spoke about ECU having internal capacitor issues or something).

Thanks to everyone in advance for thinking about this!

 

[Iannaco_16]

Just read on another thread it may be the Catalytic converter. Could pull the upstream 02 sensor and scope the cat and see if you can see any issues. From what I read the it gets clogged up from excess fuel.

 

[Dtinnc]

Just read on another thread it may be the Catalytic converter. Could pull the upstream 02 sensor and scope the cat and see if you can see any issues. From what I read the it gets clogged up from excess fuel.

Yep thank you. I have read that as well. Plus the latest codes were all even (2,4,6,8) cylinders so I think I'll have to dig in there.