What would cause a 93 Buick Lesabre to idle high sometimes as if someone had the gas

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marcosc

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petal to the floor? The car only idles high sometimes and idles down went driving as if its going to cut off. It doesnt matter if its cold or hot outside. If I took my foot off the brake and put it in drive it would take off doing about 45mph. I replace the pvc valve and check the vac any ideas.
 
yea i worked on a car like this and when you started it the idle zoomed up sounded like it was doing 90 in park but when you drove it the idle would calm down after a few seconds i didnt get a chance to diaganose it fully but i did tell the guy it was prolly a bad throttle cable or the throttle sensor is failing. but he never got back with me so not sure good luck.
 
Either the throttle cable is sticking and needs to be lubed or the idle control sensor is going wacky. That is about the only two things that it could be. I have a 93 Lesabre and there isn't much else on the throttle assemble.
 
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