I have a 2002 rav4j hard start,no engine check light,no sparks. What would be the cause?

Why did you replace cam , crank sensor's an the fuel pressure regulator too ? What is or was missing ? fuel or spark ? did you pull a plug wire an check spark . Does the check engine light ,light when the key is turned to the run position ? Do you have a professional type scan tool ? Do diagnostic's ,not guessing an just replacing part's .
056 Engine Hard to Start or No Start Misfire Scan Data
048 Engine Hard to Start or No Start Scan Data for Starting Problems
(55-62 psi) VIN: (V, T,U)
335-375 (48-54 psi) VIN: Z

So you have checked if your pump is engaging, have you checked fuel pressure or if injectors are opening? And your spark plugs look ok but have you checked for spark? Any check engine light or light on the dash?

Sounds like an ignition or timing problem.
Is the check engine light on ?
This engine uses a direct ignition system which means each cylinder has a coil on top of the spark plug. It could be as simple as worn out spark plugs.
If you had said the engine backfired and was hard to start, but no flooding, I would also look at low fuel pressure. But too much fuel causes flooding.
A faulty throttle position sensor could cause all of your symptoms, but it should set a trouble code and turn on the check engine light.

as you suggested crank position sensor cause such troubles, as hard starts and sometimes stalling. simply replace it.

Start by making sure the gas cap is secure and tight which can cause this. The most common cause is a random misfire. Your vehicle is 9 years old, so replace the spark plugs and plug wires. Have the check engine light reset and it should solve your problem. If not, have it diagnosed by a professional with a code reader.

P0305 - Cylinder 5 Misfire Detected
P0306 - Cylinder 6 Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, The Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

When is the code detected?
- Engine Cylinder #5 and #6 is Misfiring.

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation

Possible Causes:
- Improper spark plug at cylinder #5 and #6
- Insufficient compression at cylinder #5 and #6
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #5 and #6
- Fuel injector #5 and #6 may be faulty
- Intake air leak at cyli

Possible Solution:
- Perform Injector Service
- Replaced Spark Plug #5 and #6
- Replaced Injector #5 and #6
- Replaced Ignition Coil #5 and #6

Hope helps.

SOUND LIKE ALTERNATOR NOT CHARGING.HAVE IT CHECKED.YOU CAN TAKE IT TO AUTO ZONE THEY WILL CHECK ITS OUT PUT FREE.

Code P0301
Ignition Coil Pack
Ignition Cable
Spark plug
Clog or dirty fuel injector
Evap canister purge valve
Engine Compression
fuel pressure

you have 3 type of engine for your truck
2.3L 4 cylinder
3.0L 6 Cylinder
4.0L 6 Cylinder

need to know that type Engine

The reason why the service light come on because it is a hard code
not a soft code.

Let me know

usually excessive shaking of the engine caused by loose front crank pulley or damper, or loose flywheel or flex plate