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RPMs surging at idle?



Hi Listheads,

Problem:  My 1990 200tqs starts and idles at 1000, then drops to 700,
grunts a bit, then revs back to 1000.  Also, notice this at low speeds when
the "Princess" tends to surge ahead a bit in speed, then drop back.  We've
cleaned the decel valve and checked for vacumn leaks.  No change.  Any BTDTs?

Doug