GETTING MY JDM TOYOTA 4A-GE TO WORK

I browse on the web that when they are not effectively synced it might cause abundant functioning, backfiring and vibrations. Probably I'm wondering the wrong way but when they would not be synced then the gas/air combination would be various wouldn't it?Which on is broader. I'm just inquiring that simply because i have KP61 and I've only a block t