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Low power after injector replacement.

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Ricky is back for help.

2008 Mack mp8 . Just replaced injectors cups, new injectors.  But first load 4400 lbs and I don't have power that I used to have when pulling thru Iowa  small hils I have to lower gears. Also I find out that engine brake does not hold like before repairs. I did repairs at Housby in Des Moines.  Any help what to do next. Manifold pressure goes  max to 30 psi out of 40 when padal is to the floor. 

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