Stalling when stopping and driving struggles to get power also.

Stalling when stopping and driving struggles to get power also. New exhaust cat converter vehicle speed sensor, both 02 sensors, throttle pos sensor, crankshaft and camshaft sensors, idle air control value, and lastly the PCM/ECM computer is refurbished not brand new but guaranteed. And its still stalling when slowing down or stopping and in idle even driving down the road looses power and struggles to go at all and then dies. I am at a lost someone help please.