Hello. It sounds like you may have a vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak). This engine is notorious for vacuum leaks from a bad intake manifold gasket (https://www.yourmechanic.com/services/intake-manifold-gaskets-replacement). This is very common. It can also be from the MAP sensor (https://www.yourmechanic.com/services/manifold-absolute-pressure-sensor-map-sensor-replacement) or a...
