Stop an engine from heavily braking when at high RPM?

I have an issue where my vehicle will do very heavy (0.8G) engine braking if the throttle is not pressed down, rendering the car practically undriveable. How do I lessen the engine braking?

Steps I have tried:

• Setting the inertia of the engine very high (0.95-1.0). This reduced engine braking slightly but was still persistent. Plus it made the engine behave in other unwanted ways.
• Messing with friction values. This seemed to not affect engine braking.
• Changing...

Stop an engine from heavily braking when at high RPM?