Yesterday my SUV started acting weird on the gear.
When I shifted it to Drive it wouldn't take action as if it was in Neutral. I shifted back to P then again to Drive and now it worked but, since then, I notice when in DRIVE the engine wont shift automatically through gearbox. As if it always stays in the first stage of acceleration, forcing the engine.

I know it's something with the Transmission but any specific ideas?
Thanks in advance for the response