Question about 2001 Pontiac Grand Prix

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01 grand prix 3.8 won't start

2001 pontiac grand prix 3800 series motor.
while driving, the motor would rev and idle high, then misfire and die.
then the car would start back up and run fine..
over time the problem got worse, now the car will not start at all.
we've replaced EGR valve
idle air control valve
fuel pump clicks on
the control module checked out ok

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