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Message: <blockquote data-quote="SPDguns" data-source="post: 2112898" data-attributes="member: 17621"><p>Reference the Z-71 thread, BIGGSLY had a cam go out on his 6.0.    I have a '09 6.0 Silverado and the cam went out last year at about 25K.  I suspect it was related to the active fuel management.  The dealer repaired it under warranty but I'm afraid it's getting ready to do it again.  Also, on a cold start with outside air temp around 50, my truck will immediately idle up to almost 2500 rpm for no reason, then idle back down to normal.  It's random and I said something about it to the dealer and he said "it's normal....".  Of course I know better than to take it in to have them fix it unless it's doing that all the time.  It's not throwing a code and I suspect it to be a vacuum leak.  Any thoughts?</p></blockquote><p></p>