Fault code P0504, currently gears 1, 2, 3 are fine, but when switching to 4th gear, the car loses power when pressing the accelerator and doesn't accelerate. The RPM drops very slowly when pressing the clutch. Has anyone else experienced this?

When the car is in D gear at idle, it feels weak (like an ant crawling), but when you press the accelerator, it becomes normal. In reverse gear, it doesn't move at all unless you press the accelerator. The car is a 2016 Haima S5.

The 1.4T model keeps showing a fault light, and there's no 2nd, 4th, and 6th gear. The computer, valve body, and clutch have all been replaced, but the issue persists. How can this be resolved? Has anyone encountered this?

Fault code P0504, currently gears 1, 2, 3 are fine, but when switching to 4th gear, the car loses power when pressing the accelerator and doesn't accelerate. The RPM drops very slowly when pressing the clutch. Has anyone else experienced this?

When I don't press the accelerator, the speed gradually drops to 0. What's going on?

Hello everyone, I'd like to ask something. When I cold start my car, the idle speed is quite high and when I release the brake, the power is strong and it just surges forward. But after driving for a few minutes or waiting at a few traffic lights, it starts to lose power. When I release the brake, it moves very slowly, and it only gets a bit better if I press the accelerator. It's a 2007 model with an automatic transmission.

Engine shows fault code, acceleration is weak, what could be the reason?

Hi everyone, when I'm accelerating with my FJ and shifting gears, I notice that the shift from 4th to 5th gear feels more pronounced and abrupt. Is this normal? There are no error codes. It's not noticeable during normal driving, but if I deliberately pay attention to each gear shift, I can feel a slight jolt from 4th to 5th. To notice this, I have to keep the throttle steady without releasing or pressing it more. During the 4th to 5th shift, there's a noticeable abrupt feeling. However, if I ease off the throttle during the 4th to 5th shift, there's no issue at all. Any thoughts or suggestions are welcome. Thanks!

For a 2020 GS5 with over 30,000 kilometers, experiencing continuous jerking when lightly pressing the accelerator at speeds above 100 km/h, but not when pressing slightly deeper, and with no fault codes, what could be the issue?

What could be causing this issue with the 2011 Volvo C30? When shifting to 2nd gear, the engine makes a buzzing noise. There are no fault codes, but there is a throttle body fault code for the engine.

When lightly pressing the accelerator at low speeds, there's a slight jerk, and when the RPM drops below around 1100, there's a dragging feeling. What could be the problem?