October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Engine Controls - Tests W/O Codes: Symptoms: Surging

Check oxygen sensor(s).
Check EGR operation. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.
Replace ECM with known good unit.