idils fine hot or cold but sutters at 4 000 rpm, help Options

[import202]

the car is a st202 import 3sge and it was running rough on idel but now run fine hot or cold but when ya reach 4000 rpm it starts to hold back and sruges like it wants to go but cant all hose vacums seem to be good also the fuel pumps wines alot which dont thinks right so was lookin round under bonnet and sin the dreaded fse boost valve how do u remove any pics or help


thanks dave

[import202]

NOT HAD CAR LONG BUT IT STARTED MISSIN N POPPIN AND RUNNIN VERY ROUGH SO CHECKED LEADS PLUGS N PLUGS WERE OILY N N NUMBER 3 WAS WORSE SO CHAngrd THEM N IT RUN FINE TICK OVER N WILL REV STANDIN STILL FINE DRIVIN IT IS DIFF PULL OFF IS OK ISH BUT SOMETIMES WANT TO STALL THEN GOES WELL UNTILL TRY GIVE IT SOME GAS IT HOLDS BACK N SURGES FORWOARD LIKE JERKIN N WONT GO OVER 4 000 RP

ALSO HAS FSE BOOST VALVE WHICH THINK MAKIN FUEL PUMP WINE

THANKS