it may sound silly - have you checked oil level? sometimes even oil change solves problems (especially oil filter...) - of course I am talking about transmission oil
If there is not enough oil you may hear noise from tranny, it may slip... and who knows what other funny things.
Will 2002/03 Kia Spectra engines interchange with 2000 Kia Sephia engines. My books say they will, parts stores and wrecking yards say no. If not, what are the differences? My books say only "T8, 1998 and later" :confused: