ZR-1 Down =(

[Okiedoke]

I was starting the Z to go on a drive when it replied with a pretty resounding NO. The car started pretty rough doing a slow shaking and lurching all over. I gave it a little gas and the RPM came up. I then noticed some white smoke come out of the exhaust. The check engine light came on. I opened the hood and think I heard a small hissing sound like air coming out of a tire. I shut it down. When I walked to the back, I saw the exhaust had sprayed some black dots. I've included the photos below.

I last drove the car a week ago. It started rough like this, but I thought maybe it was because I hadn't driven the car in 4 weeks. When I stepped on the gas a little, the engine smoothed out. After a couple of minutes, it was back to normal. I'm thinking whether it may be something I might have accidentally touched when wiping down the engine 5 weeks ago. I was extremely careful though and the cloth was a bit damp, not enough to drip. So how badly screwed am I?

Here's the spray out of the exhaust:


Here's a closeup: