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  1. #1

    Default 1997 chevy C/K 5.7L loss of power at highway speeds

    I just bought this truck and gave the usual tune up with pugs, wires, cap and rotor. I also did the oil change. At highway speeds it seems to struggle a bit to keep up around 75 miles an hour. I have not been faster than that. I am worried about pulliing my boat because of this. I was wondering how to fix this and make my new truck "to me" run like a champ and pull like a 350. Thanks for you opinions on this.

  2. #2
    stephan's Avatar
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    Sep 2010
    Far West, Oregon USA,
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    When you did your tune up did you check the compression or do a cylinder leak down test? If not I would do this next before anything else, as 1 weak cylinder will underpower your truck. This is a very basic check & one of the most important because comp. is the foundation of your engine output.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

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