I wrote 2 or 3 days ago that my 91 2.1 was stumbling after startup,
losing power randomly and overall running roughly.

I wrote that I was going to start by replacing the Temp 2 sensor.

I did that, then I unplugged the O2 sensor, and it didn't like that at
all, but it ran better overall with the new Temp 2 and I thought it
was fixed.

My daughter drove it about 8 miles and called me to come get her. It
ran fine at first, but then, according to her "it was like it lost a
gear." I could tell by her description that anytime the engine
demanded gas, as on a hill or accelerating on open road, it would show
a loss of power.

I swapped in another AFM this morning. I started and idled it a number
of times during the day, letting it cool between starts. The stumbling
was gone. It sounded good. It ran good on a road test this evening, up
to the same distance, about eight miles in the other direction from
yesterday's run. This time I was driving. Running on the flat was OK.
A hill was a problem, I could let off the gas and the car would pull
competently but slowly. Give it gas, and the engine would almost die.

I've checked all the vacuum connections I could think of, though I
admit I know almost nothing about automatic transmissions, so there
could be something connected with that.

One more thing. On a hill on the first part of the drive, say two
miles in, when the engine was running strong, on a steep hill you
could floor it and the kickdown would only take place for about two
seconds and then it would shift back up.

Any ideas wold be greatly appreciated.

Jim