how to tune air fuel ratio???
 

Just like the title says I need to learn how to tune my air fuel mixture. I've got a naturally aspirated 88 Mazda rx-7 coupe completely stock. I ask because I believe I might be running a little rich and wont idle if the a/c is on. Any help will be appreciated.

Thanks

you can't

at least not without a piggyback ECU or standalone. with a stock car all you can do is diagnose the issue and repair it.