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Symptoms for difficult starting indicates a possible fuel pressure drop scenario and if that is the case, the most common cause would be a leaking in-tank fuel filter, which is the fuel pump housing. When problem occurs, turn ignition switch on for 2 seconds. Turn Off and back on again for 2 seconds and try starting. If it is much easier to start, then you would need to check the filter.
A fuel pressure test would only be conclusive if a pressure gauge is attached and the fuel pressure is primed and left for at least 5 minutes to monitor the drop in pressure as the leak can be minimal and the pressure drops requires some waiting.
As to the buzzing noise, it most probably is a relay buzzing and it could be from the relays in the underhoos fuse box. You would have to locate the source to find out what is causing it.
Thursday, August 19th, 2010 AT 1:48 PM