idle problem

[Aaron Ryba]

Hello listers,

My 87 4kcsq had a problem with returning to correct
idle after downshifting or comming to a stop.

The car idles fine at start up, cold and hot, it idles
fine at stop as well as runs smoothly. The porblem
only hapens when i release the accelerator and let the
car come back to idle on its own.  The car dips down
to about 400 rpm, almost stalling then jumps back to
about 1200 then rests nicely at 8-900.

I just had the emissions adjusted due to high co at
idle maybe 6 weeks ago and this problem had been
happening for the last 2 weeks.

The car has 104k mi and has had a tuneup within last
600 mi.

Is there a leaky vacume connection?
Anybody have the same problem
I am getting about 24-26 mpg ave city and hwy

aaron ryba
87 4csq
91? fuji vantage



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