i had a code for front o2 sensor and replaced the
oxygen sensor. the code went away but the symptoms are still there.
The car idles bad, cold start is horrible and sometimes even warmed up start is
horrible too. gas milage is horrible and exhaust gas stinks too.

when i searched the forum some say the o2 sensor voltage might be low
are there more check ups i should do to find what is wrong?

mods are
kelford 272cams
fp valve springs
bushur cast gt35r
exhaust
intake
evo9 bov

ive searched but no one seems to have a fix for it

 

bump ~~ anyone?