Altima's rpms goes up and down after car warms up. I need help please!!!

[TLMFL]

Hello all!

I’m new to this site and I feel like I’m going crazy working on my husbands Altima.

It's a 1998 Nissan Altima 2.4L that the engine idles fine cold but after it warms up
the rpms start going up and down by itself. If I put the car in drive and ease on the gas it stalls.
If I put the car in drive and take my foot off the brake, the car will pull itself.
I checked/tested all the fuses under the hood and under the dash on the driver side.
I removed the radiator and cap, replaced them with new ones.
A friend flushed the engine for me, refilled and burped it.
I replaced the Thermostat, after the engine flush before It was refilled.
I checked and replaced all the holes and clamps, all are tight.
I replaced the Distributor cap, rotor, spark plugs and wires.
I replaced the Fuel filter on the fire wall and checked the pressure on the rail.
I cleaned the throttle body 3 or 4 times now.
I replaced the EGR sensor 3 months ago.