[Beav]

Pumping the pedal should have no effect, maybe it justs gives you something to do while waiting for it to kick over.

Have the fuel pressure checked, while waiting for it to build up is a good idea it doesn't mean that it's actually reaching the pressure required. Normally a weak pump or clogged filter will show up at high-speed/high-load conditions though.

Have you checked the basics? Spark plugs, fuel and air filters, etc. That is always where you should first start. After that I'd be inclined to check the crank sensor signal, some cars have a tendency to start poorly if the sensor weakens with age and doesn't provide a strong enough signal. Some cars (Jeeps are notorious for this) need to crank and crank until the sensor builds up a required voltage.

If this is all greek to you, start with the basics and if the problem still exists, find a reputable driveability tech.