My 2004 sebring stalls and will not crank for hours it stalls while driveing or setting still

code p 0128 refers to coolant thermostat--coolant temp below thermostat regulating temperature ===causes --mechanical fault
replace the thermostat
your problem may be low fuel pressure from a faulty pressure regulator
have the fault codes read professionally as the code you have is not related to your problem

Well, code 336 is for a problem with the crank sensor, and code 171 is for fuel system too lean bank one which is the side with cylinder one. Since you have checked fuel pressure and I will assume fuel volume is good, the crank sensor or circuit could be at fault.

look into crank and cam sensors. any codes set? can you check for spark when it does not start?

most likely a crank sensor assuming it is just cranking without starting possible fuel pump

module on distributor or loose & dirty wire connectors

adjust the idle so there is a little more gas being run through the lines

Next time it wont start, check for sparks. Might be a bad crankshaft position sensor.
Do It Yourself Diagnosis and Repair

check for fuel pressure

hi there, i have a 2003 sonata and my car did the same. it stalled and the engine light stayed on but managed to get going again. i took it to Hyundai and it was the crank angle sensor. it needed replacing at NZD180.00 with 3 hours labour to do it. evidently they remove the front of the engine and cam belt etc. the workshop at Hyundai did it and charged 3 hours, not sure if that was excessive or not.

The ign timing is set by the computer. The crank and cam have got to be set by the timing belt, but the rest is done by the computer.

If you have "jumped" time then you will need to check/change the timing belt to fix the problem.