[irox]

Was the car running before the fuel pump was replaced?

I would guess the car had some problem, and the fuel pump was replaced in hope it would fix the problem. But since it's not ran since the new fuel pump, I'm guessing it didn't fix the problem.

I've replaced my fuel pump to fix a problem, and it turned out to be a completely different problem. In my case it turned out to be the wiring to the MAF connector, but in your case you could see those symptoms with a failing MAF.

Since the fuel pump was changed, was the fuel pressure checked?

Also, did your dad check for any error codes?
Even if the check engine light isn't on, the computer could be storing error codes that could help identify the problem.

Good luck!
Ian.