Misfire in higher RPM

[cjcposh]

During hard acceleration in 3rd and 4th gears the car misfires between 5 and 6000 rpm.Car runs perfectly otherwise.I've had sump clean,breather kit,Direct Ignition and plugs i the last 6 months so im wondering what causes this.Its a 2002 9-5 aero with 173000 on the clock so perhaps i should'nt push it that hard.Would be interested in hearing any views on this.

[Slade Alive]

Fuel pump weak delivery at high RPM. Change fuel filter anyway if not done recently. Still wouldn't rule out DI, or just a fluffy plug.

[cjcposh]

Will get a new fuel filter fitted.Once again thanks for the advice.

[jcborden]

Had similar issues on my 9-3 Aero, just when pushing it quite hard. Changed plugs and she is now running beautifully. Worth a try as it is a relatively cheap fix.

[Slade Alive]

I agree, Worth noting they should be resistor plugs. I'd go NGK every time.