Extreme shaking, fumes filling cabin, white smoke out exhaust

So my car decided to just freak out on me.
Started fine at 12:00 pm and then again at 2:30 pm. Drove it three blocks, turned it off to run in house, came back out and started it back up. It started a little rough, began shaking extremely bad, felt like it was going to shut off, fumes started to fill the cabin, White smoke was coming out exhaust and long with some sort of fluid. Engine light came on and my neighbor came with a code reader. Code reader was p0304. Upon looking it up it said it was a cylinder four misfire. Which would need a replacement of coil and/or spark plug.

I bought all parts. I replaced all six spark plugs, 1 new coil for cylinder four, replaced the gasket thingy under the intake manifold. I carefully put everything back together.
The car starts with a weird noise, still shaking mildly, and now blowing an extreme amount of white smoke with terrible fumes. More smoke after replacing everything than before.
Need help. I don’t know what else it could be.