Hesitation and High Idle after Cold Start

Hi there,  My 1997 Toyota Camry LE V6
156,000 miles - hesitates when I am in traffic.
For example, in stop and go traffic I will come
to a stop slowly, and try to accelerate but
there is about a 1 second delay when I press
the pedal and the car goes. This doesn’t
usually occur at high speeds just low speeds.  
Should also mention that when I turn on the
car on a cold start (it’s 80*F outside), it idles
at about 1,800 rpms. It doesn’t settle lower
than 1k rpms until I put it in gear or wait a
long time (5min maybe?) If I don’t wait for the
car to settle to 1k rpm, and I choose to put it
in drive, the idle drops from 1,800 to about 8-
900 (normal I think?) and the car will “walk”
at about 5mph which seems and feels rather
fast because I am not pressing the gas, and
as soon as I do it will shift into 2nd gear
because it’s already traveling fast.
Car has no CEL codes
Car passes emission test with my OBDII
scanner(Blue Driver)
Recent Maintenance done:
New Battery Replaced Spark Plugs and rear
wire set. (NGK)
New Air Filter
Changed Transmission Filter (not flushed just
drained because ATF was black)
New Engine Coolant Temperature Sensor
Tried to clean IAC with throttle cleaner
Cleaned MAF Sensor with MAF Sensor
cleaner.
Any help would be appreciated as I am a
college student and don’t have much money
to throw into parts.