1987 325i stalls

Hello everyone, i'm having a major issue with my 87 325i 2.5l auto. 4dr sedan. when the car starts idles super but when you put it in gear it dies out and it makes no difference if its warm or cold, it will restart with no problem. here are the things i have replaced and checked. new fuel pumps, and fuel and air filters, new fuel lines, fuel pressure is at 42lbs, i can hear the injectors clicking and it seems they are working, replaced the speed sensor, and double checked the speed sensor for correct adjustment and ohms, i have also changed the ecu and still have the same out come, i have changed the coolant temp sensor, and the coil,plugs, distributor cap and rotor, i have cleaned out but not replaced the icv but i seems to be working properly,any ideas will be of great help