Question about 1978 Chevrolet C1500

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1978 Chevy 350 Light Duty Truck hiccups, loses power

It started gradually, when i was cruising around 65mph, the id havesome power hiccups until i slowed down. Now it hiccups and totallyloses power when it kicks into overdrive and it is also losing power,hiccuping, and now dying even at slower cruising speeds.

Any ideas???

Thanks!

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  • jdaggett May 08, 2009

    The pickup is a 1978 Silverado 350 V8 Half Ton

  • jdaggett May 08, 2009

    just took it out and the filter is pretty dark. boy i hope thats all it is...

  • jdaggett May 09, 2009

    It runs better, but I still have the same problem. It starts when the RPMs are higher, like cruising at 65mpg + or when accelerating enough to kick into overdrive. Fuel pump or carb maybe?

  • jdaggett May 09, 2009

    can the auto shops test the fuel pump before replacing it?

  • jdaggett May 10, 2009

    It idles good and I just replaced the air filter. It runs great till the rpms rise, which is what has me confused. these trucks are pretty dang basic, which is why im confused. It seems that if the fuel pump were bad, it'd manifest itself in idle on up to high rpm, but as it is I only run into problems in high rpm and after Ive been driving the truck for a while. Thinking of it, the truck is at its worse when its warm.

  • bill dupee Dec 08, 2012

    if the truck is back firing and dieing and or back firing and still going the problems start at the heads your springs are going bad and your valves are burnt that or your timing is out of wack.

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  • Chevrolet Master
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Fuel filter i would think.

Posted on May 08, 2009

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  • Dar
    Dar May 08, 2009

    let me know.

  • Dar
    Dar May 09, 2009

    Probably one or the other... or both.

  • Dar
    Dar May 10, 2009

    Yeah, they can check your fuel pressure, but they would probably charge you more than that old fuel pump is worth. It's only two bolts and a line to take off. If it was me, i'd just put a new one on, and try it. Your air filter is clean... right? You don't hear any vacuum leaks, and it idles good?

  • Dar
    Dar May 10, 2009

    The fuel pump is probably weak and is able to supply enough gas at low speeds and idle, but not the rest of the time. They don't work like an electric one. You've checked your distributor cap, rotor, wires, plugs?

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  • Expert
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I wonder do u have headers or a stock manifold if stock check to see if the damper is open or closed ..if its closed it cant breath , also check fuel pressure and plugs, wires,cap and rotor

Posted on Nov 16, 2012

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