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Erratic Idling

Hey all,

My idling on my 87 5ktq fluctuates from 1200-1000 rpm's.  I've
cleaned the ISV but did not notice any difference.  The ISV buzzes
so I assume it works.  Also replaced the plugs with new tris.
Also noticed one of the spark plug leads read 10,000 ohms when all
the rest read 6,000 ohms.  Did the Bentley input/output tests and
found no problems.  I also notice a clicking noise that coincides
with the rpm fluctuations coming from the left fender area by the
fuel metering device?

 Any help would be appreciated.

Thanks,
Sean Dhanraj