hi i've got a 1990 wrangler with a 2.5l engine. lately, it's been running very rich. what i was wondering, is this a computer problem since the computer controls the fuel mixture, or could it be something else? also, every time i start it up in the morning or when i'm leaving work, there is like black soot on the concrete or asphalt where the tailpipe aims down too, and like water (black color) that slowly drips from the tailpipe. anyone know what my cause this problem and what may fix it? someone told me to get the engine "de-carbonized" but wasn't sure what that really meant. do you think this may fix the problem?
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