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  1. #1

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

    I just bought this truck and have had problems going over 75 miles an hour. It seems that this truck would haul ass down the highway but it seems that it is lagging in power. It has 141000mls. I have done the usual tune up with plugs, wires, distributor and cap. I also changed the oil. I was wondering if any of you have any ideas as to why the power seems low. It has a rebuilt tranny still under warranty so it not that. Any ideas would be great.

  2. #2
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    Welcome to the GM truck club.
    What were the compression readings when you did your tuneup?
    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


  3. #3

    Default

    x2. What about plugged convertors?
    Welcome to the Club.

    1999 Chevy K2500 Suburban 350
    K&N, reworked cai, Thrush cat-backs
    Vinyl, cranks, floor shift, and rear air!

  4. #4

  5. #5

    Default

    Fuel filter could be clogged. You could also try running some seafoam through your vacuum line at the brake booster and in the gas tank to do some cleaning.
    1999 chevy tahoe LS 2 door, 140k,looking good-running strong
    2000 chevy tahoe LT (new), 18" gear alloys, billet grill,black out emblem,tint,K&N intake
    :glasses:

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