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  1. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    Ok, will do!
  2. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    I will the next time I get a chance, I also had a code drop one time for #4, so I'll pull that one too
  3. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    The pre cat sensors were replaced approximately 3 years ago, they should still be good right? I will try the water bottle and stethoscope thing next time my Dad has a chance and I'll let you know! Thanks!
  4. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    I know pre cat sensors on both sides were replaced, and 1 post cat, I'm trying to remember which one. Also, the Mass Air Flow was replaced this year
  5. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    I got these 2 freeze frames today, any insight?
  6. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    I absolutely will!
  7. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    Thank you so much for all your help!
  8. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    It is rough at idle. I have to double check with my Dad and see if he checked the intake for leaks. I know he said he was going to.
  9. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    That's what I'm leaning towards too, because I clear them and they come back daily.
  10. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    Thank you! Any part I buy is AC Delco if available, if not then Delphi. My O2 sensors are Delco. I appreciate all your help!
  11. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    I don't remember which O2 sensor hasn't been replaced off the top of my head, but I believe it was one of the ones post cat. The thermostat gasket has been replaced which seems to have stopped the using of coolant and the coolant smell I was having. As for the plugs, they were removed and...
  12. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    Thanks for the info! I no longer have the misfire code, BUT I consistently have the P0171 and P0174. When I drive the truck, I feel the misfires and they happen between 1300-1800 rpm. If I accelerate to 2000 rpm, it goes away, it doesn't always happen, but there is no rhyme or reason to it...
  13. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    I have no idea if or when they were replaced. I've had the truck for approximately 4 years and never changed them. I will check the area that you mentioned. I am using coolant because I do have to add some pretty frequently. Thanks!
  14. Chevychick

    99 Tahoe w/ P0171, P0174, and P0305

    I have P0171, P0174, and P0305 on my 99 Tahoe. I know the P0305 is misfire in cylinder 5 and I know that P0171 and P0174 are system too lean bank 1 and bank 2. I have been smelling coolant and my question is could a bad intake manifold gasket cause these codes? The truck also struggles going up...
  15. Chevychick

    New Member

    Hey everyone! My name is Natalie and I'm from New Jersey. I have a 1999 Tahoe LS. My passion is restoring cars and trucks with my Dad.

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