Feed it some carbs! That should pump it up. No such thing as a "lazy" O2. They just go bad over time and aren't as accurate. Do you have a CE light on?

-'96 SE MTX 3L -'98 SVT 1,173 of 6,535 -'05 Mazda 6s, loaded, g/f's ride -Need a 96-00 manual on CD? PM or email me