You could have really dirty or imporperly operating fuel injectors as well casue poor atomization of the fuel air mixture. Spend a couple buck and get a bottle of fuel system cleaner, that might do the trick. If not, you can take the injectors out, inspect them and test them. If you haven't changed your fuel filter in the last 20,000 miles, do it now. That could also be your problem. As for my fix, I Plugged the PCV valve, and was running a breather, it worked out good.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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