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Q: high idle: when i start car it idles so fast. why? told i need motor mounts. on 1998 Buick Century

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
because motor goes clunk when i shift from park gear and engine seems to shift. also told i need new catalytic converter because car sluggish when giving throttle to stop problem of high idle. auto zone diagnostic said need erg valve. confused?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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