CAR STALLS WHEN SLOWING DOWN OR WAITING AT A STOP LIGHT

I have an Eclipse GS and I cannot seem to find the problem for why the car suddenly stalls. The car has a new fuel pump, crankshaft and camshaft sensor, and an EGR valve and circuit. The IAC valve has been cleaned. I cannot figure out what is causing the problem. The car will drive fine some days, but other days I will be slowing down to park and the car stalls or the car stalls while waiting at a stop light. Help please.