Hi, my ST170 (2003) refuses to rev above 5000rpm when in 1st to 6th. it rises fine to 4,500ish then it just stutters and holds back. It sounds like its running on all 4 cylinders when im idleing so im guessing its not ignition related. Is its likely to be the fuel pump, and if i plugged a code reader in would the car give a code?

Further info
64k on clock
serviced at 59k- planned to service again over easter
runs on shell v-power
no warning lights
has bluefin set up for correct fuel