I HAVE A 1997 CAVALIER WITH A 2.2 JUST REPLACED THE CRANKSHAFT SENSOR THE CODE PO335 STILL COMES UP AND THE CAR WILL NOT START

Error Code: P0335
Description:
Crankshaft Position (CKP) Sensor - Circuit Malfunction
Possible Cause:
Wiring.
Crankshaft position (CKP) sensor.
Engine control module (ECM).

Your fuel pump needs cleaning, I had same problem

That is a crankshaft position sensor malfunction. Replace your crankshaft position sensor. Your car may be running rough and in some cars a failed CPK sensor will not allow the car to start.

304 is misfire on cylinder #4. #4 is the middle cylinder on the driver's side.
The other 2 relate to the crankshaft sensor:

P0335 Crankshaft position (CKP) sensor -

possible causes: circuit malfunction Wiring, CKP sensor, ECM

P0336 Crankshaft position (CKP) sensor - range/performance problem
possible causes: insecure sensor/rotor, air gap, wiring, CKP sensor

Is the car running? If yes, check for a loose connector on the crank sensor. You may need to take the connector off and see if there is any corrosion on the terminals. If yes, do your best to clean with a small screwdriver and/or electrical parts cleaner.

From what I can tell, the sensor is on the bottom of the engine near the idler arm, but it has a long pigtail such that the connector is on top of the engine by the fuel rail. See pictures below.

for the misfire,

Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

CODE POO73- OUT SIDE AIR TEMPERATURE SENSOR CODE PO339- CRANKSHAFT POSITION SENSOR CIRCUIT INTERMITTENT. CODE PO335 -CRANKSHAFT POSITION SENSOR CIRCUIT MALFUNCTION.

po843 is a hydraulic pressure valve in the transmission,that will have to be replaced.The code po335 is crankshaft position sensor a circuit malfunction.The sensor could be at fault here.

Is it harder to start in cool weather?...My Olds would crank but not start in cool weather, she would cough and sputter and finally start...Shop fixed her, replaced COIL.

crankshaft sensor circuit A broken wire

That is the code for faulty connection to, or bad Crankshaft position sensor. Not 100% sure of exact location but should be near flywheel, or at front near crankshaft.

replace the crankshaft postion sensor.