1998 4Runner sputtering

I have 1998 4runner, 4cyl with 123K miles that has started to stall at low speeds and when idling. I am able to shift into neutral and restart it each time with no problems. It runs fine at normal and high speeds. I have changed the alternator, spark plugs, and had the fuel injectors cleaned. What else could be the problem? Is the fuel pump going bad?
cujo21

Do check your fuel pressure. 38-44 psi
There are sticky posts at the top of this forum with links to the 93 FSMs.
Fuel pressure regulator?
Check these in particular:
Just some ideas.

FUEL PUMP:
http://personal.utulsa.edu/~nathan-buchanan/93fsm/engine/28fuelpump.pdf

FUEL PRESSURE REGULATOR:
http://personal.utulsa.edu/~nathan-buchanan/93fsm/engine/30fuelpres.pdf

IDLE:
http://personal.utulsa.edu/~nathan-buchanan/93fsm/engine/5idleando.pdf

ENGINE:
http://personal.utulsa.edu/~nathan-buchanan/93fsm/engine.html

FSM LINK:
http://personal.utulsa.edu/~nathan-buchanan/93fsm/

Good Luck