Hi again,
Take a look at the vehicle template project. (You can create a new one, or add it to an existing project with the ‘+Add Feature or Content Pack’ button in the content browser, but if you use the add button you might also need to enable the Chaos Vehicles plugin in your project.) That will show a working input → throttle system.
We do not offer real-time help. For that, you may have luck screen sharing on the ‘Unreal Slackers’ discord server.
Cheers