why does 1999 oldsmobile bravada.. late driving idel,shaking

What is your question?

when driving it will not push motor fast with rpms..and when at a red light is feels like its going to shut down but does not. I replace spark plugs and wires I don't know if I am supposed to tighten wires a certain way or not ?

What makes this problem better or worse?

just changed sparks plugs

How long has your 1999 Oldsmobile Bravada had this problem?

2 weeks