car starts but when i put it in gear it stop
adjust your carb so it will keep the fuel up
because you are engaging the clutch which cuts out the engine for a smooth gear change
torque converter clutch solenoid.
The year, make, model and engine info would help.
Put it in neutral by moving the gear selector forward one click. Crank the key to start the engine. Put it back into drive. If done correctly this can be achieved without stopping. DO NOT PUT YOUR CAR IN ANY OTHER GEAR THAN NEUTRAL WHILE MOVING.
Check for damaged or inoperative idle control valve assembly.
I'd check the Neutral safety switch.
Your clutch is not disengaging.
It goes into reverse gear, nothing else.
the car goes back