2000 5.3 yukon xl hesitation

[Problemchild11]

My 2000 gmc yukon xl 5.3L runs and drives perfect, but when i come to a stop when i get down to about 5-10mph the rpms drop down to around 200-300 and then comes out of it by the time i fully stop, i replaced the intake gaskets, iac, tps, egr tube and valve, fpr, plugs, wires, coils, ground straps, cam sensor, and im not getting any codes, i know i need to clean the throttle body and test fuel pressure but i was wondering if there is another possible cause as to why it has that drop in rpm when stopping, if i come to a stop in neutral then it does not do it. Also does not do it when cold but as soon as it starts to warm up it does it

Edited February 1, 2020 by Problemchild11
Forgot to meanson something