1. Gino3131

    Gino3131 New Member

    my daily driver is a 98 two door Tahoe with a 5.7 vortec. My problem is when the engine starts to warm up and when it is warm, it starts to misfire when trying to hold a constant speed by foot feed or by cruise control. Recently have put new plugs and wires with dist cap also, but still have the misfire. Does any one have any idea as to where my problem may be?
  2. a.graham52

    a.graham52 Rockstar 100 Posts

    did you replace the rotor button with the cap as well?
  3. Gino3131

    Gino3131 New Member

    That also was changed, I forgot to mention that in my previous post.
  4. TRPLXL2

    TRPLXL2 Epic Member 5+ Years 1000 Posts

    Have you checked the coil?? The design of the 5.7 puts the coil succeptible to extreme heat, and causes premature failure. Normally when you replace them, they give you a grease that helps keep the heat away from the coil.
  5. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    Could it possibly be a stuck EGR valve. If it idles fine but, will miss under a load, you might want to take a look at the egr.

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