318 Poly Vibration

Try this. When it’s still running with out stalling. Put foot on brake,Put it into gear, push gas pedal to the floor and hold it there for 20-30 seconds. If the motor starts to slow down and wants to start out while ur still holding it to the floor u found ur problem. Torque converter is no good. Put back into park, shut it off , prepare to pull tranny so u can change the converter. Pull the pan off tranny to see if there is filings in it. Report back. Kim