Fuel Pump Question
 

Well i got my a/c working correctly now, but am experiencing an intermittent problem.
The cars runs excellent, but when your driving along you will feel a tug, and the tach will drop to zero ,it will jerk, sometimes it wll jerk then stall. Sometimes it starts back up right away. Other times you have to crank it a while. Then it will start and run fine. I replaced the cap, rotor, plugs, different relays were installed including the fuel injection, i replaced the coil on the fenderwall, and the fuel filter. I guess the only thing left would be a fuel pump? Its seems to be doing it more lately. Im really puzzled. Any reccomnedations on a place to get a cheap fuel pump if that sounds to be the problem.

Thanks