At 06:02 PM 8/21/2007, Evan Mac Donald wrote...
>The butterfly plate in the throttle could be worn, and the shaft and
>plate do not settle into place properly. This will have two major
>effects. One, the throttle plate will not seal off the throat of the
>throttle body properly, so you in effect have a HUGE vaccuum leak.

Just a clarification. That would not be considered a vacuum leak,
because anything leaking past the throttle plate is still measured by
the air sensor, so the mixture remains correct. A true vacuum leak
results in a lean mixture, because it's not being measured.

It would result in a varying and difficult to set idle, though.