1992 Gmc Safari mini van idles high then normal, What might be causing this issue?

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TazmanianDevil

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Well i turn on the van every morning to warm it up, the engine sounds good for the first 5 to 10 minutes then while being on "park" the engine starts to idle high then normal then high then normal. Any one have any suggestions?? Also, im thinking of bleeding the brakes, anyone have any good tips there? You think i could only bleed my front tires or do i have to bleed all four?? Thank you.
 
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