2004 chrysler pacifica

Ok I have a 2004 chrysler pacifica and I have
notice alot lately that I don't have as much get up
and go when I accelerate on the gas. Today, I
notice it was sputtering a little while driving. It kind
of jumps when coming to a stop. I have replaced
the spark plugs and wires and last year I had my
Trans rebuilt. My check engine light has not come
on yet. Also, I have been trying to get a diagnosis
on what is going on with my front passenger side.
it has alot of popping. I was told it was my cv axles
and I have changed them, and it stills pops. if
anyone knows anything please let me know. I am
clueless!