Ok, so if you have been following my thread (thanks by the way i have
received a lot of help). I had a bad fuel regulator on an 89 s10 4.3.
I just replaced the upper part of the TBI unit, the fuel meter part
which includes the regulator. Truck started up great, however it still
idles very rough. I'm fairly certain I solved my problem. Before I
could literally see gas dripping from the injector, kinda like a
shower. Nice spray, but a lot of drips from the head. Now it sprays
nice, and I can barely see the gas.

Idle in park is almost good, it seems a little slow, and after sitting
for a while it starts to stumble a bit.
However idle in drive is very different. If I come to a stop, the idle
slows down a lot and it stumbles really rough. Then it catches itself
for a second, then stumbles again.

I was driving with the bad regulator for about a month. It ran good at
driving speed, but at stop I would have to keep one foot on the gas,
and one on the brake.

So I was wondering if I messed up my O2 sensor from running soo rich
for a month. I just replaced my O2 about 4 months ago.

Or does the computer need to be reset, or just need time to learn the
new fuel mix.

Do I need to adjust anything? IAC?

Thanks