1998 Dodge Ram Dies when you come to a stop.

This sounds typical of what happens after the battery is disconnected or run dead. The Engine Computer must relearn "minimum throttle" before it will know when it must be in control of idle speed. To meet the conditions for the relearn procedure to occur, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.

If that doesn't help, your mechanic can connect a hand-held computer, called a scanner, to read the number of "steps" the Engine Computer has commanded the idle speed motor to. The motor can position itself from 0 to 256 steps. Step number 32 is typical for a properly operating engine. If the number is much lower, the computer is trying to slow the engine down or minimum throttle hasn't been relearned. If the number is much higher, the computer sees that idle speed is too low and is trying to do something about it.

Caradiodoc

It would be helpful to know what step the Automatic Idle Speed motor is asking for, but based on your comment about it working for a month after the throttle body was cleaned, you might look there again.

Loosen the AIS motor bolts, then, while the engine is running, pull it out a little. The two torx bolts holding the AIS motor on can be hard to remove so be sure to use the correct size tool to not round them out. Idle speed should increase quite a bit. If it does not, pull the motor off and check that passage for carbon buildup blocking air flow.

If idle speed does pick up, block the hole with your finger. If idle speed goes back down, the inlet side of the passage is blocked. If idle speed stays high, the entire passage is clear.

If carbon blockage seems likely, use carburetor cleaner and a small brush to clean it out.

Caradiodoc