need more power... 5.8 v8

my club wagon just aint moving like it used to.

any ideas on sometihng to give it some juice

We need more information is it just high mileage and worn out or do you have a specific problem.
Bad compression, a slack timing chain,dirty injectors low fuel pressure,ect.won't set a code but will cause a lack of power.

rebuild with forged, then a little N2O will get you down the road :D