I had to cancel last week's appt at Whitmer's because of snow, but I rescheduled for this week, and I'm happy with the results.
They were very attentive. I live about 30 minutes from Whitmer's garage, but even so by the time I got home they had left a voicemail asking me call them. During that time, they had already checked everything that it took the dealership several weeks to consider. They asked me if I had used ether or anything similar to cold start it because doing so can apparently bend a rod, so they wanted to rule that out.
Ultimately, they did a purge for the injectors, and it seems to be running okay. It's due for an inspection in February, so if it acts up before then, I'll take it back. I guess, even if it doesn't, I'll take it back to them.
Thanks for the suggestion guys.