2001 Chevrolet Blazer Weird!!!!

I changed my passenger side wheel hub assembly because my wheel bearing was really bad. note that my vehicle drove smoothly prior. We dropped the vehicle and cranked it and it idled rough, we drove it to the store only to see the service engine soon light flashing. Afterward we checked to see if we had inadvertently pulled a plug wire but all of them are secure. Is there a vacuum line close to the passenger side front wheel? I'm stumped.
Please help!!

Note:
Definitely feels like a miss but only while idling (Stoplight) and the service engine soon light blinks only when driving.