how can I increase cold engine idle speed on a '02 olds silhouette

2002 OLDSMOBILE SILHOUETTE
14,000 MILES
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TOMMYREHA
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repair shop replaced lifters(all 12) afterI got the car back I noticed that the idle speed dropped from 859/900 rpm to around 500. The repair shop told mr "thats the way it came in"--B.S. I am being told to drop the car off,& it will be looked at. any ideas??thanx !
Dec 12, 2011 at 6:21 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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