2.6 stalls after start up, only starts with alt unplugged

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When trying to start ,car starts Warnings lights come on ,no acceleration and stalls shortly after , had the crank angle sensor and alternator replaced , car will only start if alternator is disconnected , once started I can replace the alt plug, the car idle drops and the warning lights come on again but continues to run , once stopped it has the same issue until the alt plug is removed Anyone have any idea. .????