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Im at a loss. My 5.3 has fired right up every time I have tried...until after doing an oil change today and getting ready to tow it to the driveline shop. Fuel pump is working and I can smell gas while it cranks but wont fire. Has 1 trouble code p1518 which has to do with the TAC module...i have checked all of my wiring, checked my fuses. I am at a complete loss. On the bright side I tried to start it before calling the tow truck, would have sucked to pick it up from the driveline shop for it to not start and need towed again.

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Not sure if it's your problem, but I have had the plugs get gas fouled while starting a swap engine many times before everything is hooked up. Try taking the plugs out and see if they're wet. If they are, I have had decent luck burning them off with a propane torch then reinstalling them and try starting it. Not a perfect solution, but I probably did that 3 or 4 times on my '33, and its been on the road 12 years now.

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I will check tomorrow. But when I first go to start it almost fires and then kind of seems like the ecm is shutting something down. Also, with key on the pedal accuates the throttle body so I wouldnt think my TAC randomly went bad. I haven't even driven the truck since my swap and literally every time I have gone out and tried it has fired right up with no hesitation and ran as long as I wanted.