1993 Pontiad Grand prix 3.1 , stalls at low RPM and starts back up with no problem. I have replaced the TPS,Crank sensor, MAP, IAC,Air sensor,fuel filter. What next

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1993 Pontiad Grand prix 3.1 , stalls at low RPM and starts back up with no problem. I have replaced the TPS,Crank sensor, MAP, IAC,Air sensor,fuel filter. What next?

How long has your 1993 Pontiac Grand Prix had this problem?

6 WEEKS