Do I need to get the timing chain replaced? I am 100 000 km

Debbie,
it depends on the car engine design typically every 100,000 KM
is it a timing chain or a nylon timing belt ?
https://www.testingautos.com/car_care/when-does-the-timing-chain-need-to-be-replaced.html
https://www.carparts.com/carcare/timingbelt.htm
if it is a timing belt the bearings that the belt runs on can wear out as well .

Sounds to me like a fuel delivery problem. When throttle opened quickly it's starving for fuel. Open throttle slowly it's just using what it gets. Could be as little as the fuel filter is clogged and needs replaced. Could also be throttle body needs cleaned or only needs adjusted. It's definitely not electrical or firing system.

Filipe, Gates is a timing belt manufacturer and they recommend changing belt every 100,000 KM. This is what is known as a interference fit engine, If the timing belt were to break, it could cause extensive damage to valve train. Through some searching, recommended Timing Belt change interval is 60/75000 miles or every 72 months. Check the attached links,instruction and guides, Good luck
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http://www.mytimingbelt.com/Results.aspx?ModelId=52
Mazda 6 2 0D Cambelt Change
Timing Belt Replacement and Technical Info
http://www.deserttruckservice.com/pdf%20folder/gates_timing.belt.replacement.chart.pdf

Check the manual for timing belts, they very from 60,000 to 100,000 Km. Timing chains run in oil and unless they become noisy will quite often last the life of the motor.

Timing chains last the life of car or truck belts need to be changed every 100,000 km or more. Also what's the problem.

I have a 1.5 CRDi which uses the Mercedes engine and has a cam chain not a belt
Check the owners manual the chain doesnt need replacing on any of the service intervals it only requires checking and retentioning

2005 Tacomas (v6 or 4cyl) do not have timing belts. Instead they have timing chains, which do not need servicing unless damaged or rattling.

It has a timing belt, not a chain. Easy enough to check your owners manual. From memory, belt is to be replaced at about 100,000 miles or 160,000 km give or take.

If you have a chain, there is NO replacement interval. ALL 4 cylinder Highlanders have timing chains.

The dealer recommends the timing belt be replaced at 60,000 miles if it is a rubber timing belt. Newer Sedona models have a metal chain timing belt that don't need to be replaced so soon.