i have a b16 in a hatch. when i start up the car, it idles from 2500 to 600 and sometime seems it wants to die. sometimes it will be normal driving condition. sometime my tack doesnt work. sometime im not sure if my tach is working or not could when the tack drop low, the car want to die. my cel are 10, 20, 41. i know two of them will not do nothing for that but im not so of 20. help!