[MadeMan]

Add this somewhere in your script...

pawn Код:

stock GetXYInFrontOfPlayer(playerid, &Float:x, &Float:y, Float:distance)
{
    new Float:a;
    GetPlayerPos(playerid, x, y, a);
    GetPlayerFacingAngle(playerid, a);
    x += (distance * floatsin(-a, degrees));
    y += (distance * floatcos(-a, degrees));
}

...and then...

pawn Код:

if((newkeys & KEY_FIRE) && (GetPlayerState(playerid) == 2))
{
    new Float:x, Float:y, Float:z;
    GetPlayerPos(playerid, x, y, z);
    GetXYInFrontOfPlayer(playerid, x, y, 1.0);
    SetVehicleVelocity(GetPlayerVehicleID(playerid), x, y, 0.0);
}

You don't need to check IsPlayerInAnyVehicle because GetPlayerState already does that.