As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6310 - PHX-GUC - CLIMBING THROUGH 18,000 FT, THE LEFT ENGINE BEGAN TO RUN ROUGH. THE CREW DECLARED AN EMERGENCY AND DIVERTED TO GUP, WERE NOTED. THE EEC WAS REMOVED AND REPLACED AS A PRECAUTIONARY MEASURE. AIRCRAFT WAS RETURNED TO SERVICE. (M)