i rebuilt an ej25 last weekend to go in my car.
spicy cams, new valvesprings, light flywheel, cai, el-headers, cometic gaskets
i'm getting a real nasty idle,it's spends a lot of time searching (from ~500-1000rpm) and i get crazy vibration. as soon as i touch the throttle, the vibration goes away. crusing at 3-4krpm, the shiftknob is vobrating a fair bit. other than that, car drives fantastic, but what to do about my idle?
is it possible the timing belt is off by one tooth on a cam sprocket? (i'm 95% sure it's not off, but...?)
i'm running really rich right now too. matt suggested hotter plugs (93 octane)...could this be the source of my problems?
any suggestions or help form those of you more experienced in the n/a stuff would be great.