2008 gmc sierra 5.3 misses when cold. no codes

[mad1020]

i have replaced mass sensor ,all 4 o2 sensors ,intake and throttle body gaskets ,temp sensor, ecm unit and relearned crank sensor ,plugs . no codes or lights .

 

[zora]

i have replaced mass sensor ,all 4 o2 sensors ,intake and throttle body gaskets ,temp sensor, ecm unit and relearned crank sensor ,plugs . no codes or lights .

I have come across others with same issue. They point to the intake plenum gasket cracking causing a vacuum leak when cold but going away when warmed up. Do a cold start and spray some carburetor cleaner or brake cleaner around the base of the intake plenum to see what effect it has on the miss.