Engine Stumbling

[lspann3525]

This morning I went out and started my 2008 tahoe and I noticed the idle was shaky and the exhaust didnt sound right maybe because it was misfiring. So i went in grabbed my scanner and Im getting a P0171 / P0174. I have checked the intake for any lose hoses but I do not see anything. I checked the misfire log and seen that cylinders 2,6,and 8 were randomly misfiring. Anyone have an idea on how to troubleshoot this??

 

[lspann3525]

Checked the pcv line and found split

 

[lspann3525]

Engine idles better but still getting p0171 p0174 after clearing codes..and looking at the cyclinder misfire monitor only 8 is misfiring now. Sounds like bad gas?

 

[Marky Dissod]

Engine idles better, but still getting p0171 p0174 after clearing codes. Looking at the cylinder misfire monitor, only 8 is misfiring now. Sounds like bad gas?

Cylinder #8 is misfiring. Either the plug, the spark wire, the coil, or the injector is responsible.
Before suspecting what applies to ALL CYLINDERS, try any one of those things.

Move #8 plug or wire or coil or injector to a different cylinder.
If misfire follows that part, that's the problem.