Im baffled

[CaptDave]

I have a 2011 2500hd 6.0l gas. I had a mass airflow sensor code, replaced it. Then I got a map sensor code, replaced it. Then it threw a cylinder 8 misfire code and stabilatrack failure. If I unplug the mass air flow truck idles a little rough but definitely not a misfire. Any ideas, I'm at a loss. Changed plugs and wires. Switched coil pack from 7 to 8 still cylinder 8 misfire. Feel like I'm chasing a gremlin.

 

[zora]

If you clear all the codes, what code pops up?

 

[CaptDave]

If you clear all the codes, what code pops up?

If the map and map are plugged in a #8 misfire. If I disconnect the map I get barometric pressure. If I disconnect the maf I get mass air flow voltage code.

 

[zora]

So if you clear the codes you get P0308?

 

[CaptDave]

Yes

 

[zora]

Have you gone through the list of causes located here

OBD-II Trouble Code: P0308 Cylinder 8 Eight Misfire Detected

 

[CaptDave]

Everything checks out. That is why I'm baffled. I have great compression and my leakdown test on that cylinder was remarkable.