I agree about the idle issue,but it's the driving side that i can't figure out.I could have a perfectly clean car,then go around the block in my car and then the whole back of the hatch (even the glass) is covered in black.And the hesitation must be from overfueling,for when i accelerate (steady or hard) the gauge goes right around to rich,almost of the scale.My car is also a map sensored version not afm as well.So it's pretty much impossible to adjust myself.I'm just enquuiring as to whether other people have this trouble with their corollas and what you can do about it.Hence this is why i'm asking whether a fuel management system would help or eliminate the problem.