Rigidbody makes NavmeshAgent stutter in its movement

So I have a simple NavmeshAgent controlling a car and another car controlled by the player via rigidbody.add force,
The problem is whenever I go near the agent with my rigidbody car it starts to stutter in its movement but once I am away from it, It moves perfectly. Any idea why is that?
I even removed all of my scripts from the scene to make sure there is no conflicts here or there.

I know this is old, but I found this so I thought I’d leave an update for others like myself also finding this later.

TL;DR; use “Is Kinematic” on your RigidBody when combining with NavMeshAgent to tell unity that something else is controlling your body. This way you won’t have a race condition (which is what the stutter is).