Mazda: Mazda repair, electric fuel pump, vacuum tester

Question
Dear Chris,
  I know that you are looking for questions about RX7 Mazdas. But I am having a terrible time getting in touch with anyone else. If you aren't familiar with this problem or vehicle, maybe you could pass it along to the proper person. I have a 1986 Mazda 626 with the 2.0L fuel injected gasoline engine. It was running perfectly and just shut off one day. I got it running again, but if you try to rev the engine at a normal pace, such as leaving a stop sign, it will shut off every time. You can rev the engine up to redline range IF you move the throttle Very slowly from idle to normal running position. I have had the car in several different shops, and even a high school auto mechanic class with all the latest testing equipment supposedly supervised by an expert mechanic with many years experience who runs his own shop. So far, everything they have found and tried has had NO affect. The electric fuel pump and filter has been replaced, along with most of the sensors and doo-dads connected to the fuel injection system. This is not a problem found in the repair manuals. It is going to take someone who has run into this problem on a personal level to help me. I know this is an old car, but it is still in good condition and could be used for a lot more miles if this problem can be found and fixed. Any light you can shed on this dark situation will be greatly appreciated. Thanks a bunch.

Answer
Well, what it sounds like to me is something in the vaccuum lines.. sounds like you have a hole or a line is disconnected.  I'm surprised no one else has tried that.  all of your fuel systems controls are electric or vacuum controlled, so, if you have those problems, and you've replaced all the electric stuff, then I'd say it has to be vaccuum related.  Get a vaccuum tester from Napa or Sears or whereever.  disconnect one hose at a time, and check them to see if they have holes with the vacuum tester.  While doing this, you will also find  if one had gotten loose.  

If you were wondering, yes, I have run across this problem before (on an Rx-7, of course), but it had the same results.

P.S. To check the fuel pump, all they had to do was disconnect the line and see if it had any pressure... they shouldn't have just replaced it.