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it will help alot if you tell us the year of the car...

if it's an NB... idle droop is a common problem.... there are many theories as to what causes it and as many fixes...

as for the smell from the exhaust....

what exactly is the smell???? does it smell like fuel???? Is it a sweet smell???? is it accompanied by smoke????

Most likely you are not running lean at idle....
Give me some more info and I, or someone else should be able to help out!
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