Rechecking valve lash with solid lifters might help with cold hard starting conditions. It takes a little for a valve to hang down.
If it is a start up fueling problem, adjust the cranking VE table. It is reponsible for fueling at startup.

At cold only hesitation, fueling will be the main suspect. The hotter the engine, the less fuel and air it needs to keep the idle.
Bump the fuel all over to see if it cures it, and start looking for good known injectors. These knock off, no brand reworked always make more troubles than help.