It means the car is still running CIS and they have run out of fuel, so they squirt fuel in (like Mike said) where the intercooler and throttle body meet. Problem is the intake is supposed to just run air and dumping fuel in here doesn't allow for even fuel distribution between cylinders, you may have one cylinder getting plenty of extra fuel and another getting none, it usually ends up with a hole in a piston. They are not a good option
This is my old one
and this is the kind of fuel curve you get
Granted my car wasn't running well at the time, does anyone want to buy the micro fueler off me
