Hi i am new here. I have a Persona Elegance M-Line - Manual - 2011.

Sometimes I feel the car engine response is bad. It feel very underpower when I shift gear, it feel like the engine shudder when we try to let our car move on low speed with top gear. It feel delay between the gas pedal is press and the engine response kick in.

But sometimes the car feel smooth and good response when drive on next day.

Will it be ECU problem? I have this problem since I got this car 2 years ago.

Any advices & suggestion would be appreciated! ><

i shift at 2.5 to 3 rpm normally.

hmm throttle lag... so i think i will try do cleaning as what Cavino suggested. Thanks

I guess never do the cleaning yet haha. ok I wll try on that 1st. thanks