Ford Explorer XLT

You still have black smoke coming out of exhaust and idiling rough just had a new fpr installed today and new vacuum lines what else could it be 1993 ford explorer xlt?



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I had the same issue and it turned out being the Mass Air Flow Sensor and a O2 sensor, although I believe the O2 was only a secondary find and the M A F was the culprit. Even My mechanic missed it until I asked him to check it. Hope this helps