grab a vacuum gauge and set the idle mixture screws. set the idle screw 1.5 turns out from bottoming. start the car and set the idle where you want it- say, 900 for example. turn the idle screws in or out to get the max vacuum reading- then reset the idle and re-tune the screws until it doesn't make any difference. re-set the idle, and then see how it smells.
as for making you smell like fuel/exhaust- that's just the car's way of claiming you as it's life partner. no biggie. cars can be kind of possessive, and it just wants to let all the other cars out there that you are taken.
you don't plan sincerity.
you have to make it up on the spot.
wanna hear about 20 years ago when i was too smart to know any better?