yes what I mean is. You spectate someone and press "F12" and see the fuel level go 0.0. So LFS thinks the fuel tank is empty and stalls the engine.
The driver though still has lets say 0.0099999% fuel in there so he still continues to drive normal.
And since from the spectators view the fuel tank is empty it keeps stalling the engine. And since the guy you spectate is still driving normal it (tries) to keep the rmp in sync.