Running a wee bit Rough

[scot in exile]

My std 2005 with 54000miles starts to -not lose power but runs a bit rough at 90mph or over it will go but just takes a bit longer , missing the old power.
Have never changed the fuel filter and only replaced the plugs once about 25000miles ago, any ideas I am leaning towards a dirty fuel filter?

 

[sweettennbabe]

You wash it too much.LOL

 

[CanberraR3]

Maybe an identity crisis - it thinks it's balck.
I'd probably go for a new filter and plugs as starting propositions.

 

[tdragger]

fuel filter.

or maybe TPS. You know how they develop a flat spot at your normal cruising speed. In your case that would be about 90.

nah, it's the fuel filter.

 

[HansO]

Plugs or filter but the sneaky one most people over look is the spark plug leads they them selves can be the source of your woes, if they are getting a bit old they will build up resistance which will or should I say can cause a spark plug to misfire or not fire at all when under load, from memory they should be reading 20k ohms per foot (it's been a while since I have had to check a set of leads so it might be worth checking with an Auto electrician about the 20k ohms per foot) if you have a multi meter it is very easy to check before you start spending money.

 

[Battersea]

Throttle bodies out of sync maybe, have you got TuneEdit? If you have 10 minute job to fing out.

 

[Dennsell]

I would change the 6 plugs maybe it's time