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

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?

STAY AWAY FROM AUTO ZONE UNLESS ITS JUST TO GET CODES. SEEK ANOTHER OPINION FROM A GOOD SHOP
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