yaris 2008 loses power on slow speed with ac

[usmanimtiaz]

I've toyota vitz 2008 automatic, Recently my car loses power on slow speed with ac on and it vibrates a lot before shutting engine off . I've replaced injectors, plugs and installed a new battery but the problem is still there. yesterday my mechanic said this could be because of bad transmission fluid so I asked him to change the transmission oil but it was insane the problem just won;t go he finally gave up on my car by saying the only thing left is throttle body which im not sure about because there's not fault code in the ecu about it and if we replace it im not sure if it will solve the problem. (since int's an expensive part and I can not return it )
Im looking for suggestions if anyone has ever experienced this problem before, is it a bad throttle body? should i go ahead and replace it?

[RicStyx]

Possibly your ac compressor is on the way out, at high speed your engine is able to compensate for the drag its causing but at low speed it's too much, causing your engine to stall. If you switch your ac off does your car run fine?

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[usmanimtiaz]

I recently changed my ac compressor about a month ago so compressor is fine,
without ac engine does not stall but i can feel the rmp drop.

[usmanimtiaz]

if i put my car in parking and then switch on ac it works fine. this problem occurs in Drive

[castles]

I had loss of power and low idle to the point of the car dying. It was a bad coil pack. CEL would flicker but not stay on. AutoZone was able to get codes using a CAN compliant obd reader. It was random, had nothing to do with AC, in my case.

[DarkShadowFox]

which vitz the sedan or the hatchback.

[RicStyx]

On the topic of the throttle body, I would not replace it but rather clean it with throttle body cleaner, if its dirty it can cause idle issues and stalling in some cases.

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[usmanimtiaz]

yaris (hatchback)

[adeking]

Greetings from this side, I'm experiencing the same issue on my yaris sedan same year, would really appreciate knowing how this was resolved. Thanks