Fuel Starvation Problem Please Help!

:disappoin Had my car around 3 weeks and already it's playing up!

For some reason around 4-5,000rpm the car is bogging down and losing power until it settles around 1,000rpm.

It's not throwing any codes up, had it on the rolling road which confirmed it's running nearly 100% lean when bogging down.

Suggestions include: O2 sensor, vacuum pipe blocked?, fuel pump?

Have changed the fuel filter, plugs, leads all last weekend which have not improved anything. Run Red-ex fuel & injector cleaner through it twice.

Checked the voltage readings from the sensors which seemed abit high but no codes being chucked up.

Seems to run fine after you fill up with petrol for around 5 mins then back to bogging down. Even tried running it without a fuel cap but no good.

Really am down in the dumps and not even Honda can help with this one :banghead:

Any ideas or suggestion are most welcome

Thanks you all!

Forgot to mention

1994 Honda Civic SIR EG6
B16a Engine

Supersprint Manifold & Exhaust System
Carbon Air intake with Cotton Green Air Filter
Standard ECU

it sounds like you may have a bad injector. i would pull them and have them cleaned and tested. it happen to a customer of mine