2008 Silverado idles rough when starting
#1
![Default](/forum/images/icons/icon1.gif)
I have a 2008 Silverado LT, 2WD, 5.3L, with 121,000 miles. I noticed lately that when I start it for the first time in the morning the RPMs jump up and down between 500 and 1000 RPM. It also makes a fairly loud growling or rough noise. It stops idling that way once it has run for about 5 minutes or so. The growling noise doesn't really ever go away completely. I replaced the spark plugs about 2 months ago, it ran fine after I replaced them. There are no check engine lights or anything like that coming on. Does anyone have any ideas?
Thread
Thread Starter
Forum
Replies
Last Post
nascarvic
Silverado, Sierra & Fullsize Pick-ups
1
February 24th, 2013 12:46 PM
Cristobal Estrada
General Tech
4
July 16th, 2011 5:30 PM
dkerns2004
S-10 & Blazer
2
April 6th, 2008 10:16 PM