[Flake.]

pawn Код:

new engine,lights,alarm,doors,bonnet,boot,objective;

if(strcmp(cmd, "/stopengine",true) == 0) {
        new vid = GetPlayerVehicleID(playerid);
        if(vid != INVALID_VEHICLE_ID) {
            GetVehicleParamsEx(vid,engine,lights,alarm,doors,bonnet,boot,objective);
            SetVehicleParamsEx(vid,VEHICLE_PARAMS_OFF,lights,alarm,doors,bonnet,boot,objective);
        }
        return 1;
    }

Although this might not be exactly what you're looking for i'm sure you can edit it.

Credits to test_cmds.pwn


Edit: o looks like MCZOFT got to it before me, good luck