04 GMC Sierra 1500 4x4

Discussion in 'GMC Truck Forum' started by Brandon Marsh, Oct 12, 2017.

  1. Brandon Marsh

    Brandon Marsh New Member

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    So my truck has been acting up. When I drive down the interstate (going 70-75mph) I will get a jerking feeling. It only happens about once or twice at a time and will stop. Then a few moments later it does it again. It only happens at cruising speeds, not when I'm accelerating or decelerating. I can feel the jerk below my drivers seat. Ive changed the fuel pump, spark plugs, spark plug wires, and the throttle positron sensor. I took it to my machanic and he couldn't find anything wrong. There are no check engine lights or any codes thrown. Also this doesn't happen all the time. Maybe once ever few hundred miles I'll get a few jerks at a time until I shut my truck off and give it a long break. Then it won't happen the next time I drive.
     
  2. leolkfrm

    leolkfrm Full Member

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    is it the overdrive or converter lockup kicking in and out?
     
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  3. Brandon Marsh

    Brandon Marsh New Member

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    - how would I be able to tell?
     
  4. leolkfrm

    leolkfrm Full Member

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    touch on brake lightly and see if it stops, dont use over drive and see if it happens
     
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  5. Brandon Marsh

    Brandon Marsh New Member

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    - I will give it a shot and see what happens. Thank you.
     
  6. gmctrucks

    gmctrucks Full Member

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    Have you serviced the Trans and how long ago?
     
  7. Brandon Marsh

    Brandon Marsh New Member

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    I had the transmission fluid changed about 10,000 miles ago
     
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  8. dirtrider73068

    dirtrider73068 Senior Moderator
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    Could the convertor not unlocking when its trying to downshift, or might be a U-joint binding up, check the u-joints to make sure they move freely and don't have a bad spot binding it up. Take the drive shaft off and move each u-joint by hand, if you have one thats binding up you will know it. If they are greasable this would be a time to pump some grease into them, it don't take much and becarefull as pumping the grease in too much will push the u-joints cap off if they not bolted in or covered.
     
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  9. chevychase

    chevychase Semi-Admin
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    Might just have a miss? Might be just a high speed miss? Leo advise is good...can also hold upon brake pedal with left foot while driving ..to see if brake switch might be getting weak..like obamass.
     
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  10. kbrown11

    kbrown11 Full Member

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    Even without codes you can have it scanned to see if a certain cylinder is misfiring. Could be a bad coil on that cylinder. Also, clogged fuel filter. My 2003 Tahoe had a fuel filter but I don't know if your 2004 does.
     

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