Problem After Fuel Pump Install

[stevenified]

hi guys,

I've got a R33 gtr and i changed the factory item for a Bosch 023 the other day and i've now got a bit of a problem.

The car was driving fine prior but after the instllation of the pump the car has extremely rough idle (stalling every now and again) and not be able to rev past 2600rpm - it starts misfiring and black smoke pours out the back.

Originally i thought i had gotten a faulty pump so i swapped it back over for the standard pump - only to find i still had the same problem. So i threw the bosch back in there.

I've tried checking the plugs - they're almost brand new and they looked fine

I've tried changing the PFC for standard ECU - still no change

Tried checking AFM's but as soon as i unplug them the car just shuts off.

I'm not sure where to check next, so if anybody has any advice let me know!

The car is having a few upgrades done in the next month so it will be going to the tuners once everything is bolted in - so i could wait for the tuners to diagnose the issue, however i would rather have it driveable before that time!!

Thanks for any advice

Steven

[SXR]

check the fuel pressure