hi all.

i have an problem with my focus rs,

it keeps holding back and being very nervous while driving an consistent speed, its also misfires or something around 5500 rpm, and its doesnt feel like it accelerates consistantly?????

its seems to go aways when you get past 60 mph, or maybe you just dont notice it anymore then,.

does anybody know what causes this????

i already chanched:

ingnition coil,
spark leads
spark plugs,

this only seems the help a little bit

many thanks

roy