Thanks yota4runna, that is good info.
And everyone else who chimed in.

No vacuum leak here.
Most likely in my case it's a bad cat and a old Bosch O2 sensor.

...anyway the vehicle is running awesome and I'm getting great mileage, I went to another county to get a inspection sticker.
I'm good till next year. <img src="/forums/images/graemlins/shiner.gif" alt="" />

1991 FJ 80 Land Cruiser for fun.
1998 GS300 for the wife
1998 GS400 for me
1991 Supra SOLD
1986 4Runner 335k miles-22re EB inside.SOLD