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Jumping idler

Ford F-450 2007 6.0L 170075 miles
Once I start the truck after a few minutes it will rev up to 1200 rpm,for a few seconds then back down. And continue back and forth. Is this my turbo going out???
KINGBOYZ from United States a year ago  
KI
1 reply 
Dcertified from United States 13 days ago
Could be but check turbo psi under load. Also check battery voltage when it’s doing the rev
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