so i've had 1jz sc for a while now which is my daily driver. my alternator died a few days ago so got it replaced. but now the car idles very low 550-650 range. misfires a bit on idle. car got tuned on a safc a while back but now it goes lean on idle and wot too. and the safc still has the same settings as before when it got tuned. messed with the safc a bit and got the idle better (afr around 14.5-15) it misfires less now but the idle is still very low.