Forum:Help on the mission ran fa li in gta san andreas ps2

When i mission ran fa li in gta:sa i am driving with my car and then when i get tothe location of the car in the airport i have driven it and when the da nang boys shoots it my car has damage and i had cheated hesoyam and the car has full health when i cheated it again the car has only 1/4 of its health why it is? user:repel05