I'll probably give the o2 a shot. I figure the gas mileage should pick up a bit anyway. He is good about maintenance too. Oil every 3k, tranny every 25k, coolant every 50k, etc. Every other car we bought from him has been great except this one. Intermediate shaft, wheel bearings, 4th gear clutch hub, belt tensioner, intake gaskets (twice, once before we bought it), ac compressor, ps pump, heated seats, vibration between 65-70 that has gone through 3 sets of tires, and I am probably forgetting a couple. Thank god I found this site and can do most of it myself!