urgent help, judder/missfire?

[brys3]

hi, upon driving home i over took a focus rs then as i continued to plant my foot over 3000rpm it started to judder or missfire. i tried this in ever gear and is fine upto 3000 then starts to judder. i tried slow acceleration and was fine. any ideas? please help

 

[finny_quattro]

crank sensor mate....might be wrong but i changed maf lambda then crank and it was that

 

[Sandip]

I'd sway towards coilpack and plugs

 

[brys3]

i was thinking coil pack, ive had a similar judder previous which ended up being the gap on the plugs but it was no where near as harsh and was at various rpms depending on boost.

 

[brys3]

oh and ive just the codes. ive got 17863 and 17864

 

[Sandip]

Those codes are pointing at Lambda, they might of popped up because your cars been firing on 3 cylinders

 

[sportstractor]

ha mine started doing the same yesterday. definately down to plugs or coil pack as its load dependant.