Hi guys, I have been having an issue with my focus st 2009.
When I drive the car fast ie over 5000rpm then the engine management light flashes and the car starts to misfire. But if I pull over and switch the engine off and start it again the problem is gone. I have also check fault codes with bluefin which says no dtc found. It doesn't do it all the time only twice this year. I fitted rs plug thinking it was spark blowout but still no change. Ps the car is at stage 3.

Thanks!

 

I would possibly start by having it checked for codes with another tool, incase the bluefin only does eobd codes.

 

As above, also coil packs, is ur water and oil ok what is ur idle like ?