rpm in my car drops very quickly to idle when I foot off accelaration peddle

Question

I have a toyota vios 2003. When I accelerate my car(when driving at certain speed say 20km/h it accelerates lets say up to 60km/h but when I take my foot off from acceleration paddle rpm drops very quickly(~1000 which is normally the rpm when idle) and feels loosing the speed abruptly. I remember this was not like before. I recently replaced fuel filter and fuel pressure pump.  Is this normal or indicates a problem?

Michele1 · Accepted Answer

It appears to be throttle body calibration issue. I did a engine tuneup recently and cleaned up throttle body for carbon residue. After calibrating throttle body sudden rpm drops has not been observed so far at least in test drive..

Correct answer by Michele1 on July 21, 2021

rpm in my car drops very quickly to idle when I foot off accelaration peddle

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