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    Results 1 to 5 of 5
    1. #1
      Join Date
      Mar 2016

      This car is driving me crazy.

      Here is what I have, ls2 out of a 2006* in my 78 trans am with t56. I am running a qft hr-780-vs carb, with holley sniper gas tank with fuel pump in tank. I have a automotive dual stage fuel pump regulator knocking the pressure first done to 12 psi and then down to 6.5 psi for the carb. My ignition is msd 6014 box.* Timing starting at 15 and going to 28 all in by 1500 rpm.*
      here is my problem. The car will not run right.**I have the idle circuit good with afr in the 13's. But anything after 1/3 throttle under load the car breaks up, bogs, backfires and sometimes stalls. Seems like it is going lean.* Not sure if it's carb tuning or fuel starvation.*
      Thanks for any advice or help!!

    2. #2
      Join Date
      Apr 2017
      Carlsbad, CA
      Dont know if you still need help but it sounds like you need more timing. I did a little research and it seems they like more timing. Starting high like 15 degrees advancing to 33 or more. make sure you dont have any vacuum leaks as well, at low rpm it wont effect it as much. What are your afrs when it breaks up?

    3. #3
      Join Date
      Oct 2014
      DFW, Texas
      Country Flag: United States
      Quote Originally Posted by NorthFalcon View Post
      What are your afrs when it breaks up?
      same question
      1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
      1976 Dodge D100 - Warlock
      2016 Subaru WRX - E30 Tune

    4. #4
      Join Date
      Jul 2021

      Same problem!! Need help

      Just wondering if this was ever resolved and what the exact issue was because im dealing with the same exact issue with my ls swap thirdgen

    5. #5
      Join Date
      Nov 2018
      Country Flag: United States

      Vacuum secondary tuning looked interesting.
      2021 Durango R/T
      2008 Colorado beater
      2003 Dakota project-o-mobile