Hey guys got a problem. Its a 93 pickup 4wd and the head gaskets are fine. The truck has to crank for 20-30 seconds when its cold stutters and then smooths out. But if its just warmed up it starts up perfect, IE shut it off and restart immediatly. If you let it sit and idle for an extended time it will start to misfire, or if you park the truck say 10-15 min it starts rough and idles rough some times it won't start. But if you can get it on the road it eventually smooths out. I think its some sort of heat soak issue but what. It has new cap,rotor,plugs,wires,ect,maf,coil,ignition module,O2,fuel filter, and it still does this. Please help.

 

Cold start injector.

 

But why would it cause it to start missing while at idle?