RPM Flactuate while driving

Dear, I have Suzuki Wagon 660cc 2007 model. I was used it form last four years. It was working fine. From last two month it has a problem that its rpm suddenly go down while driving. When I press accelerator pad twice or thrice, it pick up normal rpm. I checked all sensor and throttle, I didn't find any problem. I also scan my car with computer but it didn't show error relate to rpm. Please advice.

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@sethkhaw , khalid , Not familiar with this vehicle, but it sounds like it may be a fuel delivery problem, possibly clogging filter/screen, dirty throttle body/injectors, collapsing/pinched fuel line, failing/weak fuel pump, clogged exhaust,etc., perhaps could use a set of new plugs in case fouled and intermittent. It is unfortunate that your code reader is not picking up errors as various sensors can cause issue, perhaps if you had access to a better scan tool that can supply live data, then you could view fuel trim, various sensor functioning, etc. to see fault when vehicle acts up. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

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khalid will be eternally grateful.
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