new fuel system new problems

[josherino]

Well on start up vacuum decreases a lot, but I think that it is the way I have the vacuum line on the afpr set up. I also discovered that if I try to drive my car right after starting it up and not let it sit for a few minutes then it dies. I am guessing that not enough fuel has been dumped into the combustion chamber, but I have no idea why it does this or why the vacuum problems. I have also notice a major problem with boost at high rpms. It seems to bog down. Could I be running too rich? All of my setting are set to stock settings and my maft is set to 660's. Please help on these 3 questions.
thanks

 

[speedmaster747]

We need more info. Like what you had before and the actual upgrades????
Fuel pump, other regulator, I saw 660's, what did you have before?
Any pics?

 

[josherino]

I had a stock fuel system. Now I have a 255lph rewired, full ss fuel lines w/an fittings, 660 injectors, aeromotive afpr w/gauge. I am getting a major hesitation at high rpm and almost a backfire around redline also. I noticed most of the problem after the 660's and the fuel pressure regulator were put in.