Chrysler Repair: 99 300M stalls, center electrode, electrical arc

Question
I have a 99 300M with 150k miles. It has been a very reliable car..until now. Last last 3 times i have been on trips over 3 hours it has just died on the interstate. It seems that after it cools it will re start. No engine light, had codes read anyway and it indicated O2 senors- which i replaced. it did it again today. I have read this could be caused by crank or cam sensors. What are your thoughts. Everything else is perfect, but this is very dangerous.  

Answer
Hi Pam,
Yes, I agree with the possibility of the cam or crank sensor, though it would be nice to have a code that confirmed that, and which one. If you want to make sure and you had a helper on board you could check for spark or not the next time it stalls out. If you can get a hold of a spark plug of any type, or buy a one new one for your engine which you can keep until you need to change the plugs. Just pull one of the spark plug cap/wires off a plug (don't pull on the wire, rather pull the cap that is attached to the wire and is itself in contact with the plug). Insert your spare plug in its place, hold the combo by the cap but touch the metal threaded part of the plug against the engine metal. Then have the helper try the starter for about 5 seconds and observe if you get an electrical arc to jump across the plug from the center electrode to the outer electrode during the cranking. If not, then that would confirm it was a 'no spark' and therefore most likely a crank or cam sensor. Both the sensor are easy/cheap labor to change, and they cost about $50-75 each. But before you buy one of the other have the codes read to see which one threw the code. Dying when hot/recovering when cold is very often the solid-state crystal behavior associated with the sensors, particularly if you can show it is a 'no spark'. When other things fail they may not kill the spark but rather mess up the mixture. It will set a code soon, I suspect.
Roland
PS Autozone Parts stores often will do a free readout of the codes, or try your ignition key:"on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. Then watch the odometer window to see if the mileage reading is replaced by a 4-digit number. If so that is the fault code. Write back for a translation, but the crank and cam codes 0320 and 0340, respectively.