If it's kept in a garage, a 30 minute drive once a month should be fine. If it's kept out doors in the elements, once every two weeks should be fine. This should keep moving parts lubricated and the battery up to snuff.
If an engine transmission light comes on in the dashboard there can be a potential problem with the drive-train. The engine's computer should receive a diagnostic to determine if there is anything wrong with the transmission.
Computer
You can drive the car but if the engine should ping (knock) under load, the knock sensor won't be able to tell the computer to retard the timing. Excessive pinging can damage internal engine parts.
You should NEVER unplug your hard drive with your computer still powered on. It will destroy the drive.
It should be in my computer (or computer) then click on the c drive (hard drive) go to program files then click on rockstar games and it should be in gta
A car with the engine in the rear should have rear/all wheel drive. A car with the engine in the front should have front/all wheel drive.
That may cause engine to run hot, if you plan on taking a long trip you should get engine in proper condition to prevent problems. Ensure car is properly diagnosed as well.
You should allow at least 10% free drive space, for proper functioning of the computer.
Ensure the computer has the appropriate driver and that the driver is in good working condition. In addition, keeping the hard drive in good condition through regular defragmentation will also help prevent freezing.
You don't have to modify it at all. They should be the same engine. Unless the 99 had a 3.1 in it then you'd have to change out the entire drive-train and probably the computer too.
Because you are using power/ torque from the motor to drive the A/C pump
If it is an external hard drive, then the computer should be able to take it. However, if it is an internal hard drive, you will have to check the system requirements of your computer.