Keeps Stalling 92 Grand Prix

Iam dumb founded on my Grand Prix. It keeps stalling after it is warmed up. Everytime I stop it stalls. I used fuel Cleaner, ran it on the highway, checked all the vac hoses, the spark plugs are still good. I put on a new starter because the starter went. It idles real high then drops. I put a new battery because that went . The alternator is good, that was tested. Any suggestions?

Does your tach jump/fall to zero and the trac off light come on when it stalls? If so, you need a crank sensor.