Oldsmobile/Buick Repair: Engine Stalling, olds cutlass ciera, shaft sensors

Question
Hi Van

I am really baffled by this continious problem, that four mechanics just seem to be quessing at. I am the owner of a 1990 Olds Cutlass Ciera with a 3.3 engine.
Whether the car is idling or mobile, it completely stalls at any time it wishes too. Sometimes when it stalls, I can start the car up right away or I have to wait till it cools down
( say 1/2 an hour or longer) before it wil start up again.
There has been a "code fault test" done on the car when it stalls ( in a mechanics shop )and the diagnostic test shows " no code faults". We have changed the ignition module and coils, checked the cam and crank shaft sensors and they are o.k.. We put in a new battery, new alternator,new starter and new spark plugs as well, but the car still stalls !!
We even pulled the collant sensor and let the rad fan motor run continiously ( to keep the engine cooler), but it stalled out again. A couple of mechanics took the car for a run and they all returned, saying that the car did stall out on them a couple of times and started up right away again.
There has been countless hours of mechanics time put into trying to find the very annoying problem, but to no final conclusion as to what the real problem is.
All the mechanics have said " there is no point putting all kinds of costly parts into the car, thinking that it could be this or it could be that, because it can get very costly, let alone the mechanics time in trying to diagnose the source of the problem"
Four mechanics later, I am no further ahead than where we first started.
What the heck do I do now?
Thanks alot !
Mark

Answer
Hi Mark,
To start narrowing things down, I would connect a fuel pressure tester, where I could see it while driving, then go for a ride.
See if the pressure drops, causing the stall, or if it stalls before the pressure drops.
If the pressure drops first, then tracking down the cause of the pump not running is the way to go.
If the pressure stayd up, then spark, or injector control needs to be checked.
But that pressure test is cheap, easy, and will narrow down the possibilities tremendously, with very little cost.
Your problem could be just a loose or corroded wire connection.
Van