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I just rebuilt the ls2 in my gto. 44lbs injectors, Rebuilt heads, crank and a small cam. Last engine killed the cam and lifters. I got everything timed PERFECTLY. All connectors/ sensors are plugged in correctly. It cranks and wants to start once or twice then shuts off. If I hold the gas down it’ll try running but it pops a little and will die when I let off. Could it be the tune or injectors? Smells like raw fuel when it tries to run
 

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You need a tune for the bigger injectors and new camshaft. The reason it smells like gas is the bigger injectors squirt more fuel at the same pulse width. You’re flooding the motor. Between that and the new cam, the computer cant keep it running.

Throw in the original injectors, or whatever injectors the car is currently tuned on, and see if it runs. You can then drive it to a tuner, swap the new injectors in, and have it tuned for your mods.
 
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