General AFR Guidance (Holley Tuning)

Do not use the AFR gauge to set the idle mixture. I'm assuming you have an automatic tranny. Gas motors need rich fuel mixtures at high load low rpm (coming off idle to get the car moving) You can set the idle mixture in N to smoothest idle and drop it in D. Set the idle mixture to the smallest rpm drop went put in gear. You need to fatten up the idle mixture and see if that helps. Also make sure the motor is at full operating temp when you dial in the idle mixture. Don't be surprised if the AFR gauge reads 12.0 - 12.5 when your done.