Bill - would you please elaborate on your setup? What year is your truck and what other mods have you done? Since your seeing more black smoke, your getting more fuel, so chances are the chip is working. First thing to check would be your air filter and restriction gauge, then hook up a boost gauge (if you don't already have one) and see what you've got there. Hope its an easy fix and welcome to the forum 
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Put a Turbo on it!!!! 
'95 F-250 Powerstroke, 350,000 Miles, Mods: Phoenix chip, 140V IDM, Diamond Eye DP to 4" straight pipe, CCV mod, Amsoil synthetics throughout.
'04 F-350, XLT Lariat, Powerstroke, CC, Dually, SS exhaust, AirRaid intake and filter, Edge Evolution, PHP FICM programmer.
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