If in fact the spray doesn't work, heres an idea....I've had some idle headaches myself on my 98'.....Three parts took to solve the problem: 1) Idle regulator valve, 2) Fuel regulator valve and 3) Vent line.....When you remove the engine cover you will see a plastic tube (about an inch thick) that makes a U-turn from the throttle body to the oil separator unit (that's your Vent Line), attached to the end of this line and to the throttle body are the Idle regulator and right under that is the fuel regulator....replacing these parts did it for me along with the gas filter under the car. Good Luck!!
Chucky
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