car tries to crank but want on 2003 Nissan Altima

i replaced the spark plugs boots and coil packs. the pcv valve crank and camshaft sensors. it turns over and tries to crank but wont.

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2 answers
Throwing parts at a car trying to get it to start is an expensive way to fix something. Have your car towed to a reputable shop for a proper diagnosis and have them make the proper repairs.
crank sensor is a common failure that results in extended crank time. it is buried behind the motor by the motor mount.
before you do this, it is a good idea to get a real diag to pin point the failure.

Roy