Oldsmobile/Buick Repair: 90 3.8 olds stalling, coolant temperature sensor, egr valves

Question
Hi, I had a stalling and spuddering issue on the way home tonight. Changed the fuel filter right away but still the same problem. I can borrow a guage to test fuel pressure if you think I should. What should the numbers be? Not looking forward to dropping the tank but will tomorrow to replace the pump. The car has 110k on it and I don't know the pump history.  Thanks in advance

Answer
Hello Billy,
If that has throttle body injection, the pressure needs to be 13 PSI...running or not.
If it has a different type of injectio, the pressure will be more, like around 35PSI, but I would look it up to be sure.
There are a few more things that could be causing it.

I would probably test or replace the coolant temperature sensor. Read the following topic.

http://www.chevytalk.org/threads/showthreaded.php?Cat=0&Number=1366279


Clean the idle air control valve and egr valves also.

http://www.misterfixit.com/egrvalve.htm

The MAF sensor can also be a cause for problems. The following is a Ford link, but I just haven't found a GM link that explains it so well, and they work the same.

http://www.fordscorpio.co.uk/cleanmaf.htm

And running some injector cleaner through the tank could also help if the pressure is ok, but the injectors might be dirty.

Van