Does the car crank over every time?
How good of a mechanic are you?
What'* the condition of the usual tune up items?
Correct Fuel pressure for your motor is 25-35 psi when the motor is running, 34-40 psi just before it starts.

Here'* a quote from the dealer service manual.

HARD START
Definition: Engine cranks OK, but does not start for a long time. Does eventually run, or may start but immediately dies.

CHECK:
Throttle position sensor for sticking or binding or a high TPS voltage with the throttle closed (should read less than .700 volts)
High resistance in coolant sensor circuit or sensor itself. (Code 15)
Fuel pressure.
Water contaminated fuel.
EGR operation. Be sure valve seats properly and is not staying open. (Chart C-7)
Check the plugs.
If engine starts then stalls disconnect MAF sensor. If engine then runs and sensor connection are OK, replace the sensor.

start with the basics before you do anything major, spark plugs and wires, air filter are a good start...

could be injectors leaking, bad ground, vacuum leak...

tomburt, that'* the idea behind following the service manual...

try this: turn key on, wait three seconds, turn key off, turn key on, wait three seconds, try to start. If it starts easily this way then the injectors need cleaning.