Re: hesitant acceleration
Transmission rebuild is cheaper, if you know what your doing or have a good place to take it too. When you changed the fluid, it wasnt a complete flush, the new fluid broke loose some of the sludge in you tranny. You spool valves are probably stuck with varnish and all kinds of crap now. But you definitely need a diagnostic run on it, and yes it will throw codes and set your check engine light.