Originally Posted by
alaxfire
The starter motor in all Crossfires is electronically controlled.
All you have to do is momentarily turn the key to start, then release it.
The starter will run for approx 4 seconds, or until the engine starts.
On auto transmission cars, there is a locking mechanism ( cable ) between the ignition key assembly and the transmission shift quadrant. You must be in position 2 to be able to move the lever out of Park.
The original symptoms you described sound like a CPS getting ready to retire.
( CPS = Crankshaft Position Sensor )
REPLACE ONLY WITH BOSCH - AVOID THE CHINESE AND MEXICAN ONES.
As above, from my mercedes experience if you release the key they will continue to crank for around 4-5 seconds or until the engine starts whichever is sooner, hence its something you only ever notice when you have a problem as the car usually lights up within just over a second.