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erratic idle

Dear List
My 86 5000CSTQ is idling about 1900-2300rpm and then after a few minutes 
will drop to a normal 900.  Works fine in the morning when cold for a few 
minutes then goes into it's high idle routine.  I have checked for air 
leaks and can't find any, have also replaced the idle stabilizer with no 
affect.  Any ideas?
86 5000CSTQ
91 100S
71 Chevelle 454SS