YOUNG GUNS15

ok i have a 94 12 valve that i just installed a 4k govenor spring in, right now it wont let me get too far above 3000 rpm and it starts to make a weird pop and cutting out noise so i shift right at about 2900rpm insted of maybe 3200 or 3300, did i do something wrong when i installed it?
i measured the clearance between the nut and the top of the stud. and i got it pretty close to the original settings.

mdavlee

timing or fuel pressure will cause the popping

YOUNG GUNS15

the timing has not been tweaked to my knowledge, the pump was rebuilt 2 years ago by preavious owner and a different cam plate was installed then...

BigErksG2

timing can slip and over flow valves can wear out. fuel pressure is easy to check and fix with minimal tools. i would start there.

97 D-Tec

i could have sworn part of the requirements for a 4gsk is a enough fuel, and valve springs. probably its just going to sit there and miss on the top since you dont have much fuel. i mean a fuel plates good and all but with 160 dvs and stock injectors idk how you can make it.