poor performance

  1. G

    No acceleration no fuel economy flickering gauges/power

    So my Sierra has been giving me **** the last few weeks. It’s a 94 Sierra k3500 454 4l80e. The truck has zero acceleration at any point, runs like **** and sounds like a miss under load. Sunday I’m going to clean the grounds, put an o2 in it and try to figure it out since I need a radiator...
  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. O

    truck boggs down when accelerating

    hello all, long time lurker first time poster here; 1998 GMC Yukon SLE 4x4; 5.7, 4l60e, 10bolt rear TLDR: truck shows 2 codes p0740; TCC solenoid, and p0452; FTPS low voltage. recently did a mild engine refresh with a few performance parts, and a Blackbear tune, the truck feels really sluggish...
  4. 96CK

    1996 GMC Z71 - 220k - Rough Idle/Hard Start - New to Me

    Well, I suppose this is as good a place to place an introduction as any. To start off with, it feels good to be back on a forum, I haven't been on one since I had an LS1 powered F-Body. Alright, so I just purchased this truck as a fixer to daily driver project. They just don't make them like...
  5. D

    Can't get it running right -

    Greetings all - - I have a 1998 GMC Suburban K1500 with the 5.7 Vortec engine. Recently, I have had issues with the way it runs - - I will be driving along and all is good, and then all of the sudden it will lose power, start sputtering, and sometimes even dies. I shut off the key (I can put...

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