Engine force starts too strong.

[lazermaniac]

After duping a vehicle and activating its engine, the sound pitch is initially extremely high. When the engine is throttled up and the gear is switched from neutral, the engine applies an excessive force to the wheels, causing a jump. This is accompanied by the following error in console:

[ERROR] addons/acf/lua/entities/acf_gearbox/init.lua:394: attempt to perform arithmetic on a nil value

1. Act - addons/acf/lua/entities/acf_gearbox/init.lua:394
   1. CalcRPM - addons/acf/lua/entities/acf_engine/init.lua:294
   2. unknown - addons/acf/lua/entities/acf_engine/init.lua:186