HELP 03 lb7 not running good?

NWTDIESEL

On a Time Out
May 8, 2008
1,405
0
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ATS Extreme trans
He took his truck to the dealer after blowing a injector cup, the dealer put new head gaskets and redid the cups and now it wont run worth a shit! He took it back to the dealer and they re-flashed the computer, it still has no balls stock. When he puts the PPE on level 7 it smokes alot but it doesnt go anywhere. What could it be?

His truck ran like a striped ass ape before it ever went to the dealer.....He was getting 14.5 pulling a trailer and now he gets 5.7mpg on the same PPE tune level 2.