Hi guys. I know this has been covered a million times. I have a 57 tbird with a 312 - Fordomatic. Holley 4 barrel 4160 model - 465 cfm. Vacuum reading is 19 inches. The idle mixture screws are turned out 1 1/2 turns per side. When I first start and drive the car and its running cool the idle is very smooth. Acceleration from a stop is good. As the engine gets hotter the car develops a idles rough. I had read in a past post to lean out the mixture. I did that and it worked. The idle is again perfectly smooth when the car is at full operating temperature. However when pulling away from a stop, the car stumbles. Another issue i had was a lumpy idle where the engine would rock from side to side. The mixture screws were turned out 1 1/2 turns per side. When I leaned out the right side by 1/2 turn the rocking was eliminated. I am thinking perhaps the right bank does not require as much fuel as the left side. Is this possible?



Thanks all.