Horrible gas mileage and a few other problems

Discussion in 'Chevy C/K Truck Forum' started by Arbitert343GS, Aug 21, 2013.

  1. Arbitert343GS

    Arbitert343GS New Member

    I have a 1999 Chevy C1500 with a 5.7, and I have replaced the entire ignition system just about, Cap and rotor, plugs, wireset, and coil and Im getting anywhere from 7-10 mpg. I have been blowing through caps and rotors almost monthly, I even tried sealing my last one to make sure moisture wasn't getting in the cap and it only made it worse. And somewhere in 2nd or 3rd gear(dont remember which of the top of my head) it will start missing or something and the tach will show it moving up and down a couple hundred RPMs, you'll even feel the truck slow down and pick back up. Ive tried a block test to check if a head gasket is leaking and it didnt show any signs of combustion gases in my coolant, this problem is literally driving me insane and broke because I cant afford all the gas its needing. Heres a few pictures of the distributor cap, it will do this almost monthly. It wont bring up any codes for it either. Anyone know anything that might help? Thank you.
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    Last edited: Aug 21, 2013
  2. K15 Blazer Guy

    K15 Blazer Guy Member 2 Years 100 Posts

    wow lol
    try adding a fresh ground from the engine block to the battery negative
  3. Dawson

    Dawson New Member

    how is so much debris getting into the cap?
  4. K15 Blazer Guy

    K15 Blazer Guy Member 2 Years 100 Posts

    maybe your distributor is shot?

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