I need some collective help.
I gave my 1992 to my brother. This spring it has absolutely no power and is
getting less tha 20 mpg.

I changed the fuel filter, spark plugs, spark plug wires.  It spits and
sputters through the entire RPM range. It almost feels like it is getting to
much fuel "loading up" as some might call it.  Any suggestions on where to
look or what to check?

History.
I bought the car with 95,000. Then put another 120,000 on it. @ 210,000 I
put in a used JDM motor. When I put that motor in I could not get it to
start. Took it to the dealer - $350 and not much of an explaination of what
the probelm was it ran fine. The only thing they could explain was it was
not getting any fuel in the cylinders. The service manager said he did not
know exactly what the mechanic did to resolve the problem. This was 10,000
miles ago.  I have the old motor to swap out sensors etc if necesary. I'e
already swaped O2 sencer from the old motor.

I'm in Milwaukee WI - the car is in central Minnesota - over 9 hours away.
I gave the car to my brother when I found out he had cancer. He's fighting
the cancer and making progress - but still in treatment. When I gave him the
car I was hoping it would be something "fun" for him to do to get his mind
off of cancer, if even just for a moment. Alas, it has not been fun...

Any suggestions on what might make the engine load up on fuel? Sensors to
check?

Trustworthy  import mechanics north of St Cloud Minnesota? The local
mechanic looked at it and concurs that the engine is loading up. But has no
knowledge on where to stat. At least he was smart enough to know his
limitations.

Thanks,
Greg