I took off the upper intake manifold in order to reach behind and clean off the alternator and one of the exhaust headers. There was a bunch of burnt oil on them (not my fault I got this car like a month ago so still cleaning up the previous owners mistakes) and it was causing some pretty bad smells. Anyways, after I put the intake manifold back on, the car sputters and dies on start. I attached a video of what it sounds like. It’s a pretty gnarly sound so I’m hesitant to turn it on again. All the vacuum hoses are connected, I tightened the clamps on the intake and throttle. And no, the engine didn’t shake like that before. If anyone has any idea of what could be going on, I’d be happy to listen.