My son drove about 500 miles last Friday night.  About halfway he got
off the highway for a "pit stop" and when he came to a stop at the
light at the exit ramp the car stalled.  He had to hold his foot down
on the gas to get it to start.  For the rest of the trip he had to put
the car in neutral and give it a little gas to keep it from stalling at
stop lights and stop signs.  There was an continues to be no "check
engine" light.

I have replaced the fuel filter, replaced the spark plugs (two were
burned quite badly), replaced the spark plug wires, cleaned the
throttle body including the passage to the IAC, removed the IAC and
cleaned it wtih throttle body cleaner (it was quite dirty on and around
the plunger that goes through the orifice), and replaced a couple of
vacuum lines (I found one off) and one dried and cracked.

Now...it will start cold with now trouble.  It will idle pretty well.
However, when it sits and idles...or is driven and then stops...it
develops rough idle.  It it idles under a load (with the a/c on) it
idles rough and stalls.  Every time it stalls...you have to hold the
gas down to get it to start.

I have looked for a way to get the codes out, if there are any, without
going to a shop and having it scanned.  I found one on line...but..it
didn't work.

Before I take it to a shop to have the codes pulled I am wondering if
anyone has any ideas.