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Try pinching off (close) the vacuum hose that runs from the engine through the firewall to the heater/AC. Use a vice grip pliers or a large binder clip from the office supply. If this helps, you have a split hose or vacuum solenoid diaphragm or broken plastic vacuum tee under the dash. Replace that if that is the problem. Generally after 15 years, all the vacuum hoses and tees and diaphragms should be replaced if you want reliability. For safety, also replace the three brake hoses to the wheels, and the three fuel hoses on top of the fuel tank. Historic rubber is just dirt in stick form.
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