Intrigue :: Turns On / RPMs Drop / Engine Sputters And Dies

'99 Intrigue (3.5L) with 65k miles. The car has sporadic starting problems where turning the key in the ignition turns the starter motor and results in one of the following scenarios:

1) The engine does not turn on.
2) The engine turns on, RPMs drop and the engine sputters and dies.
3) The engine turns on with no problems (like this morning).

It does not appear to matter whether the engine is hot or cold.

Reading forum posts of people that have seen similar problems, several different solutions would seem to be in order:

1) Replace fuel pressure regulator.
2) Replace crankshaft position sensor
3) Replace camshaft position sensor
4) Replace fuel filter
5) Replace spark plugs
6) Replace idle air control valve
7) Clean the throttle body

Since I rather not start throwing money at the car by replacing parts one by one until the problem is gone.