Hello Shimon - can you tell us a bit more please? Does the engine stall immediately, as if you turn off the ignition when you put the gear selector in D or R, or does it sort of slowly die out? Does the engine rev up well in Neutral, or does it hesitate and can't get up in RPMs? Does the constant speed solenoid (a device that serves to increase the idle speed when putting an automatic-equipped car in gear so it will not stall) work, and is it adjusted correctly? Tell us more and we can help.