ECT = engine coolant temperature; this is what computer uses
to determine whether engine is cold or warm or somewhere in
between.  It is not the same sensor as the one that operates
the guage on the dash - only the computer "sees" it.
Located front left side of intake manifold - easy to change.
Have seen several with bad connections.

TPS = throttle position sensor.  Computer uses it to
determine homuch "gas" you are giving it.  Throttle should
only be depressed when driving.  There is a case where the
engine may become flooded and you would full depress the
throttle to clear the flooding.  The computer will sense
full throttle while cranking and turn off the fuel injectors
to clear the flood.

ISC = idle speed control which does just that any time the
engine is running.  Your engine has no cold start valve.

Since you say the engine is running rich, I would also check
the fuel pressure.  If the regulator fails, the fuel
pressure will go skyhigh resulting in a very rich condition.
Sometimes, the regulator diaphram fails resulting in fuel
being dumped directly into the intake.  This will not set a
fault code in many cases if the computer is able to
compensate on it's own.  You have to test for it with a fuel
pressure testor.  If you pull the vacuum line and find fuel,
the regulator is definitely dead.

If you do not have some basic knowledge of the system and
how it works, you can spend a fortune throwing parts at if
with the only results be a greatly reduced bank account and
a bad attitude.  There is a great publication on Ford Fuel
Injection by Probst which explains how the system works and
how to troubleshoo it.  Many public libraries have it.  You
can usually find a copy online for about $25US.  If you are
screwing around with Ford EFI, it is well worth it.  There
are several sites on the net which explain Ford
abbreviations and ECM fault codes and how to extract them
from the EEC-IV system.