How do I fix the cruise control an a 91 Buick Park Avenue?

Sometimes when you press the button, the cruise engages, sometimes it doesn't. Does anyone know how to fix this? Or what do I check? Thank you.How do I fix the cruise control an a 91 Buick Park Avenue?Had same problem on the 94 model, same car. Turned out I just needed to get a new air filter. If that doesn't do it, try some spray lubricant around the connections.