I just put a 4k gsk kit in my truck and around 3k and past it breaks up alil. Is it possible that I need to put more time in my pump or would bigger injectors alone fix it. I think it's just lack the fuel for that high. Please help me out.

 

i have the same issue with mine and its still at stock timing but it has 370 marine injectors and a 0 plate so it has plenty of fuel. ive been told on here to bump the timing. im thinking of going around 15.5 or 16.

 

mine used to break up around 2500, i bumped my timing to 16.5 n now its smooth all the way to redline. i've heard that with 370's you have to watch how far u advance because of the different spray angle.