Question about 1998 Chevrolet K3500

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1998 chevy silverado 7.4L 454 big block v8 dually 4x4 won't stay running. Cranks, starts, then dies. Does not seem to be a problem when it is cool. After running and getting heated up it won't re-start. Have replaced starter, fuel pump (new connections) and crank shaft position sensor. Truck has a GM dealer installed alarm system. Could that be the problem? Is there a temperature sensor that could be bad?

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Do not think alarm would cause this do you have a check engine light on?? there is a coolant temp sensor that reports to pcm it could be out of range you need to hook vehicle to a scanner and check the temp that is being reported by coolant sensor when cold and when hot also may want to look at mass air flow sensor also have you even thought of ignition module what symptoms you have sounds just like an ignition module problem

Posted on Apr 26, 2010

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