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Home >> Mercury >> 1987 >> Topaz LS, FWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.3L HSC/CFI Testing >> DRIVEABILITY Tests >> Intermittent Surging At Steady Speed

Intermittent Surging At Steady Speed

Check plug firing voltages, cylinder balance, base ignition timing, spark plug type and MAP sensor. See MAP SPECIFICATIONS  table at end of article. Check flow of fuel injectors and fuel pressure.