The "HOLD" indicator began flashing last night for

Check the fuel level sensor.

Sounds like your alternator stopped working....

You may have a sensor malfunction. Have a mechanic run the codes and see if there are any stored in the computer. Just because the engine runs OK now does not mean it will continue to do so. The reason the light goes off after the vehicle has set over night may be due to the vehicle not sensing the issue after the long passage of time, until you begin driving again.

dust on your abs sensors needs cleaning

A couple of possibilities. You should consider changing thermostat and coolant. Also fan belt that drives waterpump should be replaced, and lastly new radiator/coolant cap (they do loose ability to hold pressure)

Information taken from: http://www.idavette.net/tech/oilreset.htm

[quote]
The "Change Oil" indicator is reset by using a sequence of Driver Information Center (DIC) key presses as follows:

1. Turn ignition "ON", but do not start engine. (ALDL pin "G" should NOT be grounded.)
2. Press the "ENG/MET" button and release, then, within 5 seconds, press it again.
3. Within 5 seconds of Step 2, press and hold the "GAUGES" button. While the button is held, the "Change Oil" indicator will flash.
4. Continue holding the "GAUGES" button until the "Change Oil" indicator stops flashing and goes out, indicating successful completion of the reset cycle. This should take about 10 seconds.
If it does not successfully reset, turn ignition "OFF" and repeat the procedure from Step 1.
[/quote]

replace your fuel filter

I somewhat agree with other solutions on this page. I agree that what you are describing is a severe misfire, however there are MANY possible causes for a severe misfire other than just the spark plugs...I recommend diagnosing the CAUSE of the misfire before spending any money "GUESSING" and replacing a bunch of parts.

Also, a code P0300 is a "RANDOM MISFIRE" code which indicates that there is definately more than one cylinder misfiring. Your computer MAY display this code, however, a SINGLE cylinder misfire can also cause a loss of power and the check engine light to flash.
You may just have something like a bad coil on one cylinder that needs to be replaced. This is why PROPER diagnosis is recommended.

Some months ago I began starting the engine of my 2001 Chrysler 300M but turned it of before it really started "was sloppy with the key". The anti-theft system went on for some unknown reason. I disarmed it by disconnecting one of the battery connections under the hood with a wrench. I connected it again, the anti-theft system was off but the battery was dead. Battery was OK after recharging, I have had no trouble since then.

NEEDS AN OIL CHANGE. YOU CAN RESET IT YOUR SELF. HOLD IN THE "TRIP" BUTTON AND TURN THE KEY ON (DO NOT START IT) 5 DASHES APPEAR AND DISAPPEAR 1 AT A TIME THEN 5 "0"'S AND YOUR DONE. SOMETIMES THEY HAVE TO BE ON "TRIP A" BEFORE YOU START