its very simple man, i have a 93 Si, stick and i had the same problem, so what i did, i just set my rpm level a lil higher, u will need a flat head screw driver, you can find that screw somewhere around the throttle body, or just ask your mechanic to do for it, it should idle a lil bit below 1 right now, but when i did mine, i set it a lil bit above 1. At start up, its a lil above 1, but right when the car warms up, its back right under 1, and i dont have that vibration problem. hope this helps