Hello, sorry to hear of these issues. There is a Technical service bulletin about the torque converter not unlocking. This would cause a stall when engaging the truck into a drive gear, including reverse. This would explain why it's stalling out on you intermittently. It may just be the torque converter lock up solenoid just being stuck at some points and releasing at others.
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Saturday, December 26th, 2020 AT 5:06 PM