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97' k1500 misfire

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Krajsa11, Mar 6, 2009.

  1. Krajsa11

    Krajsa11 New Member

    i have 97' chevy 1500 with a 5.7L 350. i have an engine misfire when i reach 2500 RPM. i have replaced the dist. cap, dist. rotor, plugs, wires, fuel pump, fuel filter, cats. it still misfires. it doesnt miss at idle just mostly when it hits 2500 RPM. the engine light was on but is now off. cylinders 5 and 6 are the only cylinders misfiring. anyone had this problem or know how to fix it? let me know. thanks
  2. ct9a

    ct9a Epic Member 5+ Years 1000 Posts

    What were the engine codes that showed up? Is this a TBI engine?
  3. Z71_guy

    Z71_guy Epic Member 5+ Years 1000 Posts

    97 should be a MPI, ill look tomorrow on identifix to see if others have had a similar issue
  4. Krajsa11

    Krajsa11 New Member

    its a mpi and the only engine codes showing up is the o2 censor. the only cylinders missing are #5 and #6.
  5. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    97 k1500 misfire

    Sounds like what my freinds 98 1500 was doing, it would spit and sputter going up even small hills, it was 02 sensor. Sorry but I dont remember if it was before or after cat. If I find out I will post.

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