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smog test failure

Engine

Model: 993, Year:1995, Mileage:64,000, Type of use:Street use only
1995 993-Failed hydrocarbon smog test @ 25 mph (Max 50 ppm-Meas 67 ppm.) I had placed a bottle of "PRO-GARD" fuel injector cleaner into the gas tank prior to the test. Could this cause the failure? Shop replaced the Mass Airflow Detector, but this only lowered the HC slightly.The car is driven only approx. 250 miles/mo.

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