Bogging only at startup

[Hornsurgeon]

Ok 2 weeks ago I picked up an 04 Tahoe with the 5.3 and 168k on it. I have no records of what was all done to it previously. Am having an issue with it Bogging down when I first start it in the morning.  It doesn’t matter if it’s in drive, first, reverse, or neutral. As I attempt to accelerate, it bogs down, then starts surging trying to catch up.  After 20-30 seconds it goes away and is fine the rest of the day. I originally was thinking of cleaning the throttle body/maf/tps, then plugs/wires.  However, I started thinking. For the first 20-30 seconds, doesn’t the engine run on preprogrammed settings until the computer starts collecting data from the sensors?   Do I need to get my pcm reprogrammed?