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  1. #1

    Question 99 Burban Rough Idle and stumbles at 45 mph

    Hey all am new here and have some questions. We have a 99 Burban 1500 5.7 with 126,000 miles. The problem is the idle is rough and 'stumbles' when going about 45 mph when trying to accelerate. When I say stumble it's like riding on the rumble strip on the side of the road but more intense. It every once in awhile throws a code for 4th cylinder misfire...not always. It also stumbles when I slow down then try to accelerate. Can hear spark knock at that time. Any suggestions would be appreciated.
    What's been done
    plugs and wires x2
    fuel spider
    fuel pump and filter
    spark knock sensor
    egr valve
    coolant temp sensor
    map sensor
    ignition module
    throttle position sensor
    cam position sensor

  2. #2


    I had a similar issue on a 99 burb last year. It turned that my distributer cap and rotor were in sire need of replacement. It was a fairly simple fix and relatively cheap. I would at least look at the inside of the cap. Hope that helps.
    Chevrolet Avalanche 1500 Z71
    5.3 Liter

  3. #3


    @2lock , any luck on a fix?

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  4. #4

    Default same

    Quote Originally Posted by Pikey View Post
    @2lock , any luck on a fix?
    no luck checked the distributer cap and rotor all good....driving me crazy

  5. #5


    Had similar symptoms myself. I noticed you done the spider assembly. I would probably lift the upper intake manifold and check for extra clean spots and smell of fuel. My problem was a leaky fuel pressure regulator on the passenger side dumping fuel right in to number 4 and flooding that one out.

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