[bensaccount]

I am asking because we have a 2008 Sierra 5.3 that we have done everything to in an attempt to fix it. It is not a D.O.D. CYLINDER, so can it possibly be that it needs a lifter swap if it is cylinder 2 and not a displacement on demand cylinder?

 

[bensaccount]

All of the above twice. Everything has been checked off. Before we do the lifter, can that be the problem on a cylinder that is NOT d.o.d. is the question. Is that even possible.