Check for a broken vacuum hose or vacuum fitting(s). you can use a can of spray carb cleaner. while running the engine use the spray to test hoses and fittings. give a little squirt to suspected areas. The idle speed will change when you find a vacuum leak. pay particular attention to the hose to the MAP sensor. There may be a problem with the elelctrical connection to the map sensor, or the sensor itself may be bad.
Manifold Absolute Pressure Sensor
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