Just put in my 2nd fuel pump and both sputter when the rpms and boost go up.
Car starts to buck until I get off the gas. I can ease the gas in until about 6k without any hesitation, but if I floor it, it won't go. Any ideas?
Yes, I searched.
My only thought is that the pump isn't sealing into the black grommet on the top of the pump.
What gives?

 

thats probably what it is..other people also see this problem

 

what mods do you have?

Fuel possibly?

 

Vishnu stage 1, perrin full exhaust with no cat.

 

Make sure you have all of those plastic/ rubber spacers/grommet things on. It happened to me I thought one wasnt needed . Put it on an all was good.