i just installed a 255lph pump on my 91 teg from treperformance.com, this is my second go around with there pumps, so after installing the pump and testing everything out it seems to be fine. the pump responds very well through out the rpms but as soon as i come to a stop or slow down the car will stumble and some times die. it will do this every time i stop, im at a loss here and dont know what else to do, my stock pump is fine but cant handle the fuel demand since its a turboed ls engine.

 

ttt

 

Get a pressure gauge and check it.

Go from there

 

psi is at 40 at idle and when it is stalling it fluctuates between 4-20 psi then it dies

 

ttt