car didn't feel 100% , didn't really try to boot it either, drove sensible.

Took spark plugs out and looks like their are little white spots on the plugs.
Is it running lean ?

It was gentle motorway traffic it last done, but tought they should be browner ?
CO was fine in june, Fiesta RST

 

Yes, white would indicate lean running...

 

indeed

 

Still don't get how it comes ? was all fine last august, take her out again and it's not right anymore?

 

Blocked fuel filter / poor wiring on fuel pump / lazy fuel pump?