90 ZR1: Oh crud, did I break it?

[GTOger]

Happy Thanksgiving everyone. The wife and I decided to take the ZR1 to the family turkey extravaganza about 15 miles up the road. It ran great all the way there and half-way back. At the half way point, things got ugly.

All of a sudden there was a loss of power and the engine was running rough. Definitely not hitting on all cylinders. Pulled up at a stop light and it didn't really want to stay running. Without giving it little throttle bursts, it would have died.

There was no "drama" leading up to this. I hadn't been hot-rodding. There wasn't any bang or other indication. Gauges remained normal and no indications on the cluster.

At the next light I saw that there was smoke coming out the back when I gave a little gas.

We limped home and into the garage and I shut it down. It smells to me like there's unburned fuel in the exhaust. We unloaded the leftovers (mmmm... turkey....) and then came out and lifted the hood. No signs of external trauma. Nothing leaking, seeping or oozing. Oil is still full (and clean).

Started her up again and it continued to run like crud. White smoke from the exhaust.

Just under 28k miles. No mods save for a B&B exhaust and K&N filter from previous owner.

I'm trying to reassure the wife that the car we got 3 weeks ago will be alright again. I know the injectors are notorious on these cars, but maybe it's spark.

Any recommendations on where to start? Maybe this looks familiar to somebody.