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Thread: Need help asap

  1. #1

    Default Need help asap

    i have a 2003 1500 5.3 non flex motor. just recently we took a long family trip and the car ran right for 300 miles. we got home and the next day it was running very harshly. it is ideling low and you can feel a misfire. then as rpms increase it is bogging out and will not even operate close to a highway speed. it is throwing a random multiple misfire and MAF sensor code. we replaced the MAF sensor and both codes are still being thrown out. someone please help.
    thank you for any useful info

  2. #2


    o yea. i'm trying to test the coil pack. how would you do this. i tried using a multimeter but the readings went all over the place.

  3. #3

    dwill3015's Avatar
    Join Date
    Jan 2007
    Yacolt, Washington
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    On my Wife's 2001 Suburban 5.3 it had a rough idle and a miss. It was throwing random misfire codes so I replaced the plugs and wires and it still did not correct the problem so as a last resort, I took it to the dealer and they found a bad coil pack. I do not know how to test or troubleshoot the coil packs but that was what the problem was it has ran fine ever since. Good luck!
    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.

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