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Have you done a compression check? (I know that's a pain to do unless you remove exhaust mani's, which is its own ordeal). Also, the pressure built up during the first couple rotations will need to bleed off in the couple cylinders that didn't finish a cycle, also be sure to have A/C off to not have extra things happening, yet.

For a less intrusive check, you can try a coolant pressure tester (a store should have one to rent, check for videos to get familiar). This could indicate if you have a leak at an intake gasket.

Also, you can try a fuel pressure test gauge to ensure it's getting to the rail (or at least press on valve at rail after start attempt, but wrap area with rag, cuz it's probably gonna spray some gas).
 

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Sounds like a vac leak somewhere letting lots of air in, acting like a stuck throttle?
 
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