I am having trouble starting my 1998 k3500 7.4l dually. One day it just shut down. Wound up being the coil. I replaced it and drover her for about 2 weeks. She shut off again. Thought maybe it was fuel pump. I replaced the fuel pump nothing. Replaced the coil again. Nothing. I replaced the camshaft postion sensor. I also replaced the crankshaft position sensor. I replaced the rotor and distribitor cap. I also replaced the ignition control module. Also the fuel filter. I am getting beautiful spark and plenty of fuel pressure. I am at my wits end with this truck and i cant think of anything else. Also i replaced all 8 spark plugs. I checked the timing by putting her at tdc. I also checked the maf sensor and map sensor. Please if anybody has any info please help...