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On the 89 it is the vacuum bypass valve - retail about $200 only from Ford.

I have never fixed mine. Have been driving it for 2 years like that.

Also I blocked the vacuum bypass and bolted it back on, I did see a small amount of idle decrees but not enogh to be worth the effort.

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Q: What causes a 1988 Ford van with a 460 engine to idle fast even when it is warm?
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