2002 Chevrolet Silverado 2500 HD Q&A

2002 Chevrolet Silverado 2500 HD Question: my truck is still running sluggish after doing a lot of repairs to after thecode

I have replaced the coils, Intake and valve cover gaskets, fuel regulator,fuel injectors plug and wires and it still has no power what else could it be -
Answer 1
Is there a check engine light/ service engine light soon? -