bad mpg

  1. S

    Fuel Economy Tanked in Suburban

    Hello Everyone, I have a 1997 Suburban 350, 3:73 and 4x4. I've always consistently been getting 17-18 mpg on the highway but recently its tanked and max I can get is 13. Its not the worst but there definitely is something funky happening. Everything seems to work fine (although the power on the...
  2. C

    Engine Wimpy, MPG Insanity

    So I have a 1994 k2500 with a tbi 350 in it and it's sent me on a wild goose chase for the better part of this year. Right now the engine mechanically seems to run perfectly fine, but mid-acceleration it is lacking power and runs a hair rough. But when either just coming under load or upper...
  3. McSweeney

    97 vortec 305 intermittent low power, poor mpg rough idle in park.

    I have a 97 c1500 5.0 vortec it has weak acceleration, poor idle, and horrible mpg. Ive replaced a lot on this engine including all ignition except for the distrutor, and upgraded the injectors to mfi. Still feels the same. Once in a while it will feel better like it has good power again, but...
  4. S

    Expensive trouble shooting

    I have a 2000 k2500HD with 7.4 vortec. 3 weeks ago while leaving work, like 5 miles away, I down shifted, nv4500 manual, to get into the on ramp of a highway. Immediate misfire, shaking, sputtering, loss of power, and became a massive fuel dumper as well. No engine light, throwing passenger side...

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