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?

[kufor]

just to confirm the prediction ... the tooth was off on the timing belt
response is fine now

...i just got a feeling that the new timing belt with other stuff is somewhat squeaking when braking with engine
it will definitely require proper check, maybe something was forgotten ... again

it looks like i have to start taking care of my car by myself, buying the neccessary tools will be probably cheaper than paying the prices in car repair service