R4PTOR

Hey, just bought a used 1995 civic coupe ex. I was looking at different reasons as to why my car shakes and the speedo has the needle slightly bouncing on 1000 rpm in idle. Found my way to the fuel system hose behind the engine, and the clamp wasn't attached properly. so when I reattached it, immediately white smoke started coming out of my exhaust. There is also a black like substance coming out of it. I also noticed that because the previous owner had it so dirt nasty low, what looks to be the cat looks loose with some type of cloth coming out. Haven't jacked it up to look yet.

also, there is oil that seems to be sort of wet but just lightly caked on the front of the engine block. under the valve cover.