By stick, do you mean it won't move when you first put it into gear? If so, try not setting the parking brake as a test, if you are not parked on a hill of course. If it drives off normally the rear brake shoes may be sticking to the drum due to water, brake fluid, wheel bearing grease acting as glue and holding the brake shoe to the drum even though you've released the brake handle. Remove the brake drums and inspect carefully for leaking wheel cylinders or grease escaping from the wheel bearing grease seals.
Chino Autotech Inc.
Auto Club SoCal AAR