Engine strats,runs for thirty seconds shuts down and wont restart

contact any detroit service centre and have the fault codes read.

Not necessarily. There was a re-call on the cooling system a few years ago. Check with your mechanic about that. ------------------------------------------------------------------------------------
Digiprog3

Could be any of several things. If the crank sensor is marginal and not sending pulses, the fuel pump is shut off. This is for safety. The pump is energized for a few seconds as key is turned in preparation for starting then engine must rotate normally to keep the pump on. If it stops, in a few seconds the fuel is cut off.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

possible fuel pump relay.When engine stalls and wont restart listen at fuel tank for fuel pump to buzz for three seconds when key is turned on.

it could be a clogged or failing fuel pressure regulator

there is no code its in the key. they sometimes will lose the required resistance.
there is a reciever for the signal on key in ignition and in the key.do you know if this is the type you have?

check the engine ground strap

What about battery and alternator (serpentine belt).

hi they may have trapped the wiring on the crank position sensor or its rubed through you need to see if there is any spark to verify yates210456