LS3 Need LS Guru help

[Timberline]

Hi all,

I have an LS3 525 crate motor all GM electronics, 6spd manual.

My issue is when cruising at a light throttle when it gets to 3500rpm the car jumps comes alive almost like hitting nitrous. It’s as if it is at 50% horsepower the 3500 boost adds another 50% horsepower.

I have taken it to to someone that works on these every day to have things looked at pulled intake and went all the way through the car bumper to bumper. Ran the computer while driving to check things out and adjust the tune the 3500rpm boost went away. Months later the 3500 boost is back.

any ideas?




thanks in advance. Jeff