I have tried in vain to get this problem solved, and I have finally
decided to try the vast knowledge of other Olds owners.

I have a 1985 Cutlass Ciera 3.0L 2bl carb with 40,000 original
miles(literally owned by a old lady).  When I received it, I replaced
the sparkplugs, fuel filter, & added a re-usable hi flow air filter.
Soon afterward, I noticed that I started needing to apply gas pedal
during starts, where as before, the car started up with just pressing
down the pedal, and letting up and starting like the instructions on
the visor said.  When I apply gas, it takes about ten seconds "catch",
before I can take my foot off the gas.  I also get a good amount of
smoke. It also revs down to almost a stall out and then surge when left
at idle for longer than 1-2 minutes.  I cleaned out the carb, checked
all the hoses under the hood, and decided that maybe the fuel filter
was bad again because the car had sat for a few months before I got it.
I changed it, same problem, so then added in a puroleter in line
filter(the glass kind you can see thru).  Still continued.

So now, I have this weird check engine light problem.  If I am
traveling at about 60+ miles an hour for a few minutes, I sometimes
(more often than not) get a check engine light.  If I keep up the
speed, it stays on.  But if I back off the gas a little, and then
re-apply, it goes off.  It will also go off if I let the car slow to
about 50-55.

I haven't tried to pull the engine code, because #1, I'm a little
afraid to try, and #2, I commute to work, and don't have much of a
chance to get to a mechanic except for the occasional weekend oil
change at a local garage that doesn't require appts for it.  But before
I take a daty off to bring it in, I wanted some opinions as to what it
may be from some people who have olds experience.  Any help you can
offer will be greatly appreciated.
Thank you.