What could be the reason for the throttle of a 2003 S80 automatically revving up to four or five thousand RPM? [Facepalm]

When starting the Kaiyi X3 2021 model 1.5T automatic, the RPM can reach up to 1,450. Occasionally, it only reaches 700 or 800 RPM. Do other cars have this situation as well?

Hello everyone, could someone help me with this issue? When in Park and idling, if I rev the engine above 1600 RPM and then release the throttle, the RPM stays around 1600 for about ten seconds before it drops. This doesn't happen if I don't exceed 1600 RPM. Between 1600 and 2000 RPM, there's a noticeable jolt. Additionally, when shifting gears and slowly accelerating, there's a rattling noise between 1600 and 2000 RPM, but it disappears after 2000 RPM. Does anyone have any insights on this? I would really appreciate it. The car model is a 2016 30T two-wheel drive. Thank you very much!

Car enthusiasts: Sometimes when driving a small car, the D gear won't shift up. The RPM suddenly goes up, but the gear doesn't match. What could be the reason?

When driving at low speeds over rough roads or speed bumps, and then accelerating, the RPM between 1100 to 1500 feels like it's cutting out. Once the throttle picks up, everything returns to normal.

Is it normal for my manual comfort version car to have the engine rev up to 3000 RPM and make a lot of noise when driving over 100 km/h on the highway?

Hey car enthusiasts, can anyone help me out? My 2015 manual Sunny only revs up to 2000 RPM when I floor the gas pedal, and the acceleration feels weak. What could be the issue?

As a new driver, I've only driven the 2019 2.0 model, and I find the acceleration quite sluggish. When I press the gas pedal deeply, the engine needs to reach around 1800-2000 RPM to speed up a bit, and the engine noise is quite loud. Is this normal for a naturally aspirated engine with a CVT? I tried using the DS mode, which seems to provide what I consider normal acceleration, but I noticed the RPM goes up to four or five thousand. My friend's 1.5T Geely doesn't make much noise and feels more powerful.

My car is a 2013-2015 model Jetta with a 1.6-liter engine. Sometimes when starting the car, the engine revs low, leading to failure to start properly. Normally, when a car starts, the engine speed should be over a thousand RPM before settling down to idle speed. However, sometimes my car starts at 800 RPM, feeling like it's about to stall. The battery is newly replaced, and tests show no issues with it.

[Shocked] What's up with this car? Starting in S mode, I floored the pedal, the RPM hit 4000 and it was still in 2nd gear without shifting up automatically. It only shifted to 3rd gear after releasing the throttle for 3 seconds.

In the morning, when starting the vehicle and driving at low speeds, it occasionally stalls. I've already cleaned the throttle and injectors, but it still stalls sometimes. If the speed picks up, it doesn't stall. What could be the reason? 🤦‍♂️