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Misfiring on Uphill 04" 6.0 Excursion

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#1 ·
I got a 04 Excursion 6.0. It feels like it's misfiring going up hill when I give it gas. I also notice black smoke coming from the tail pipe when it does this misfire. its worst when I tow uphill. any idea what's wrong or what I should check for? I do get a check engine light when this happens but goes away soon after. codes I get are P0672 and P0674 and P0676. I just had injector #8 replaced with a FORD OEM injector. Thanks
 
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