Trick for quicker revs?

My motor is a slow revver...always has been. It's perfectly normal on the rev-up...but it takes an eternity to fall back down. It's like the computer hangs it at 1300, then 1100, then finally lets it drop back to 800. What's the cause of this...or is it a problem? Car runs great...just got it running again earlier today. It's just irritating to start it, and have to wait 10 seconds before I put it in gear because if I don't, it'll stall out or chirp the tires if I give it extra gas.

Lol, I know what it is. It's only about 6 months old and is cleaned approx. every 1-2 months, when I clean my TB. I remove the motor from the assembly and fill it up with TB cleaner..

Plugs are light to dark tan. The car has been tuned to run richer than normal via an AFPR, since I have modified intake/heads and stock injectors. I clean it so often because I clean the throttle body fairly often.....it gets light buildup from the PCV return that I like to clean out. I usually do the IAB because it's right there, and it's not like it's going to hurt it by cleaning it.

O2 sensors are maybe 8 months old. Coolant temp sensor, maybe 10 months to 1 yr old. Intake temp sensor, where's it located? Throttle position sensor is around a year old, and the EGR valve is maybe 3 months old. Basically, every sensor I'm aware of, I have replaced. The PCV valve is around a year old also, and the screen was replaced because the old one...well, there WASNT a screen in it at all before.

The I had the upper intake off earlier today....the upper and lower look to be very clean inside. Only a few runners on the lower intake had discoloration (black-ish).

As far as ignition goes: Fairly new spark plugs, MSD 8.8 Superconductor wires, MSD cap and rotor that are 8-10 months old, and the distributor gear and pickup coil were both replaced. The coil is an MSD Blaster TFI.

And the stall problem, it's not cold start. It only happens because the idle hangs and if I need to get it into gear fast, dropping it into drive from like 1300 rpms will stall the car.

The TPS was set quite a while ago, and the idle speed has been tinkered with frequently since. How can I set the TPS voltage? I have a digital multimeter, but I'm electrically retarded and have no idea how to use it. And also, I lose the probes for it somewhere...all it has is alligator clips.