2004 Chrysler 300M intermittent hard to start

SOURCE: 2000 Chrysler 300M. No start tIminig BElt???

youre probably looking at 600 to 800 dollars to have the car repaired

SOURCE: 2004 chrysler 300m code p0344

P0344 Camshaft Position Sensor Circuit Intermittent

SOURCE: I need a free owners manual for a 2000 chrysler 300M

There will be a few minor differences between the 2000 and 2004, but for the most part, you can use the 2004 manual as a reference. Since it is illustrated, you can confirm visually when you are taking on repairs. I have owned a 2000 300m for several years. Might I recommend you visit 300mclub.org? I am a member there and have learned a ton about 300m's.

SOURCE: 2004 chrysler 300m 3.5L waterpump location and

Yes the water pump does run of the timing belt system.
Directly from the service manual:

The 3.5L water pump has a die cast aluminum
housing and a plastic swept vane impeller. It bolts
directly to the right rear timing belt cover using an
O-ring for sealing. The water pump is
driven by the engine timing belt.

REMOVAL
The water pump on all models can be replaced
without discharging the air conditioning system.
WARNING: DO NOT REMOVE PRESSURE CAP
WITH THE SYSTEM HOT AND UNDER PRESSURE
BECAUSE SERIOUS BURNS FROM COOLANT CAN
OCCUR.

NOTE: It is normal for the water pump to weep a
small amount of coolant from the weep hole (black
stain on water pump body). Do not replace the
water pump if this condition exists. Replace the
water pump if a heavy deposit or a steady flow of
engine coolant is evident on water pump body from
the weep hole (shaft seal failure). Be sure to perform
a thorough analysis before replacing water
pump.

(1) Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).

(2) Remove accessory drive belts (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).

NOTE: The water pump is driven by the timing belt.

(3) Remove engine timing belt (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT AND
SPROCKETS - REMOVAL).

(4) Remove water pump mounting bolts (Fig. 31).
Note position of longer bolt for proper re-installation.

(5) Remove water pump body from engine

Here is link to get a factory service manual relatively cheap.
2004 Chrysler 300M Service Manual Covers every serviceable part.

SOURCE: 1999 chrysler 300m wont crank, code P0340

Sounds like the timing belt broke. Unfortunately this vehicle was not equiped with no contact valves so if that is the case you will need to have the engine and Head rebuilt. If the crank position sensor can't sense the position of the crank it should shutdown the electrical to keep you from damaging your engine.