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The trottle of my toyota yaris seem not to be working. Whenever I slow down, I will have to march on the accelerator completely before car can move again. It is very bad especially in terrible traffic situation. Once I use the brake, the trottle does not work. I have changed the fuel pump, changed the Electronic Control Unit ie Green board yet the problem persists.

I would appreciate it if anyone with similar experience can share it and help me with a solution.

Please help.