Slow throttle response Options

[kufor]

i'm new in here, so first of all "Hello everybody."

i just bought celica ST202 3S-GE (170hp) few weeks ago
on monday the first service visit has been completed:
change of timing belt, oil, oil filter, fuel filter, air filter and spark plugs also (NGK)
coolant has been checked and refilled, brake fluid too

unfortunately something got wrong, because the response to throttle is kind of slow comparing to what it was before the servicing
ECU reset didn't help

does anybody know what might be the issue please?
...or at least what to check before driving to toyota dealer?

[OOBE]

^ True.