running rich

my 2000 focus is running to rich on bank 1:screwy:. anyone have this problem? if anyone knows why? let me know
thanks

i replaced the pcv valve thinking it would help but nothing!!!

ok - there is only 1 bank on a focus so the whole thing is rich - first try to unplug the maf and monitor 02 values.

why unplug the maf sensor?

while there is a lot of things that will change fuel trim - the maf is the primary sensor for computer trim adjustments.

I see so unplug the maf sensor and moniter o2 valyes? how do i do that?