I am thinking abut buying my neighbor's 1999 Buick with 40K miles. However, it has been sitting in the driveway for a year or two. I know it hasn't been driven, and I have never seen them start it. They took good care of it before her mother became unable to drive, but it has just been sitting ever since. I have always heard that is bad for a car, but don't know why it's bad, or if I should even consider this car.
It sounds like the car was not properly cared for during the two years. Depending on weather conditions in your area of the country, letting a car sit without running the engine or doing scheduled maintenance can cause several problems. The tires also need to be checked for wear and tear as sitting for a long period with driving on them can cause safety problems as well.
Before you buy ask the owners or have it towed to an ASE certified technician to do a complete inspection and have all the required maintenance done or get an estimate of repairs needed to make the vehicle safe. You can also run a CARFAX.com report to find out the entire history of the vehicle.
You can locate an ASE Certified Blue Seal Repair Center here:
Go here for more good information on what to do before buying a used car: