GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 4 of 4
  1. #1

    Default Random Cylinder Misfire...Help!

    I have an 03 Silverado 1500 V8. It started running rough & idling low. The check engine light did come on & stay on. I had a friend read the code. It said it was a random misfire. I changed the plugs, wires, & fuel filter, & cleaned the maf sensor. I 57K miles on it. What could it be?

  2. #2

    dwill3015's Avatar
    Join Date
    Jan 2007
    Yacolt, Washington
    Blog Entries


    Bad coil pack. I went through the same thing with our Suburban 5.3 throwing the "Random mis-fire code" and after changing plugs, wires, fuel filter and still ran rough, I took it to the dealership and they found it right away and replaced the bad coil pack and it has ran like a champ ever since!
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  3. #3


    Thanks. Is there anyway to tell which one it is or is it best to just go to the dealer?

  4. #4


    Ok. So I took it to the dealer & they replaced 2 coil packs & added some fuel injectorcleaner. It is still running rough. They told me to drive it & it would get better. I have driven it about 40 miles so far & it actually seems to be getting worse. It bogged down & died on me twice in less than a mile. Luckily I was almost home. Does anyone know if it could be anything else? Should I keep driving it? Thanks for all the help so far.

Similar Threads

  1. 5.3 Vortec random misfire code
    By 00sierra53 in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 26
    Last: 12-03-2013, 12:01 AM
  2. Cylinder 5 Misfire
    By philosofy1 in forum GM Powertrain
    Replies: 14
    Last: 04-20-2011, 09:25 AM
  3. Help..random cyclinder misfire
    By Robs97Chevy in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 0
    Last: 02-12-2010, 09:53 PM
  4. Random Misfire and Bank 2 02 sensor
    By UBSTANG in forum GM Powertrain
    Replies: 19
    Last: 01-08-2010, 11:11 AM
  5. Random misfire 97 silverado
    By 97silvy in forum GM Powertrain
    Replies: 7
    Last: 09-21-2009, 10:17 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts