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Engine stumble

Discussion in 'Tech Discussion' started by Aaron w, Jan 24, 2021.

  1. Aaron w

    Aaron w Junior Member

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    Joined:
    Jan 24, 2021
    Location:
    Centralia, wa
    First Name:
    Aaron
    Truck Year:
    1977
    Truck Model:
    K10
    Engine Size:
    5.7
    I had purchased this truck 3 years ago and have slowly been replacing the badly rusted spots. I finally got it running and when I took it on the road it was interesting. I put it in gear and it stumbles, I push the accelerator and it stumble badly to the point it wants to die. Could anyone please help me out. If not then it is off to the shop.

    Thank you
    Aaron
     
  2. PrairieDrifter

    PrairieDrifter Full Access Member

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    Joined:
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    Location:
    North Dakota
    First Name:
    Mason
    Truck Year:
    84,79,77,70,48
    Truck Model:
    Suburban k10, bonanza k10, c30 C&C, c10, gmc 1/2ton
    Engine Size:
    350, 350, 350, 350, 350
    Carb rebuild most likely. Not knowing anything about the truck or history
     
  3. Bextreme04

    Bextreme04 Full Access Member

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    Location:
    Oregon
    First Name:
    Eric
    Truck Year:
    1980
    Truck Model:
    K25
    Engine Size:
    350-4bbl
    Carb rebuild, maybe vacuum leaks, maybe cap/wires/plugs, maybe all of the above. I’d start with a compression test and check the vacuum at idle. Then I’d be setting the initial timing, then setting the idle speed and idle mixture. You should probably check the condition of the ignition components including spark plugs and air filter before doing anything else.
     
    RedBeard_83 likes this.
  4. Snoots

    Snoots Supporting Member Supporting Member

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    Location:
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    First Name:
    Roger
    Truck Year:
    1973
    Truck Model:
    Jimmy Sierra
    Engine Size:
    350
    Sounds like a vacuum leak or timing issue.
     
    RedBeard_83 likes this.
  5. SquareRoot

    SquareRoot Full Access Member

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    Location:
    Arizona
    First Name:
    Mike
    Truck Year:
    85
    Truck Model:
    K20
    Engine Size:
    350
    Shit can it. LS Swap.
     
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  6. Ricko1966

    Ricko1966 Full Access Member

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    Location:
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    First Name:
    Richard
    Truck Year:
    1975
    Truck Model:
    c20
    Engine Size:
    350
    What year is it? What engine? If it's carburated check to see if you have accelerator pump shot. And how are we supposed to diagnose a stumble without pics. Rusty will school you on this.
     
    SquareRoot likes this.
  7. Poppy 87

    Poppy 87 Supporting Member Supporting Member

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    Location:
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    First Name:
    John
    Truck Year:
    1987
    Truck Model:
    R10 Silverado
    Engine Size:
    305
    Be sure to add fresh gasoline and fuel filter to the things listed previously
     
    Snoots likes this.

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