Need help after installing fpr and fuel pump, and car sputters Options

[02bluerolla]

Well I been gathering parts for mycar ., supras 550, fpr, walbaro fuel pump, powerfc , 3inch downpipe, a slightly bigger charge cooler for my w/a setup and next on the list is the ct20b and a tune

well today i decided i wanted to install the fpr, injectors, and the fuel pump raise the bost to 15 psi . After iam finish i start up the car and it idles good, so i let it warm up and take it for a spin. iam on second gear and decide to revved up a little , i reached 4500 rpm and the car sputters really bad. (btw this is on 8 psi) so i go home and check the fpr, and it reads 55psi. ..... I tought it should be 35-38? well now iam stumped on why my car is running bad so any help is really appreciated.

[DEATH]

I can get you one pretty cheap right by my house/your work. LMK when you're ready. I also have that EGT gauge I need to return anyway cause it's orange but I got a HELL of a deal on it so if you want it I'll pass that deal on to you [Not that you need it for this problem but while it's there snatch it up if you want it].