I believe my engine uses a timing chain and not a belt. Also, it seems like some days, my car runs very strong but then once in awhile it feels very sluggish. If the car needed a tune-up, I would think it would run poorly all of the time. This problem seems to be more sporadic. As a general rule, timing belts should be change at approximately 60,000 miles.
Timing chains have a longer life and are normally changed during an engine overhaul.
Your car has a timing chain. As to your sluggish problem, if the catalytic converter is damaged, the exhaust is likely being restricted. I recently bought this car as a second car to travel to work. The previous owner recommended the timing belt be changed at this time. My mechanic said this car did not have a timing belt.