Engine Controls - Trouble Shooting - No Codes: Symptoms: Surges

Check for vacuum leaks.
Check ignition system. See TEST JB under SYSTEM TESTS in SELF-DIAGNOSTICS - VILLAGER article.
Check idle air control system. See TEST KE under SYSTEM TESTS in SELF-DIAGNOSTICS - VILLAGER article.
Check fuel delivery system. See TEST HC under SYSTEM TESTS in SELF-DIAGNOSTICS - VILLAGER article.
Check EVAP system. See TEST HX under SYSTEM TESTS in SELF-DIAGNOSTICS - VILLAGER article.