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Vibrations during acceleration are mostly caused by an issue with the drivetrain and the first thing you should suspect is unbalanced driveshafts, CV joints, or prop shaft depending on vehicle type. Could also be unbalanced tires showing more when acceleration, but driveshafts are far more common.
Unfortunately, it can be quite tricky to test them and the best way is to have a car lift and try to see where the noise is coming from.
You can check out this article for possible causes if you haven’t: https://mechanicbase.com/driving/car-shakes-when-accelerating/
Check for any oil leaks coming from the valve cover gasket dripping down on the exhaust manifold. This is a very common issue when you can smell a burnt smell but no oil on the ground. Oil leaks can be really tricky to find and the easiest way is often to clean the whole engine and then driver for a while and check again
Hmm I didn’t exactly understand that with the load meter. However, it could be a faulty starter also. So when the car won’t crank over I would try to hit the starter with something to see if it helps – if it does the starter is worn. Some more info here: https://mechanicbase.com/troubleshooting/how-to-start-a-car-with-a-bad-starter/
I would also put a jumper cable between the engine and body on good ground points to see if it helps. If it helps, there is definitely bad ground between the engine and battery or battery to body.
You could have damaged or moved the ABS sensor wires if you are unlucky. Another reason could be if the front and rear tires are different sizes. This could lead to different speeds on the wheels which will trigger an ABS error.
The easiest way forward is probably to read the codes from the engine and abs control module though to know which wheel to start the troubleshooting at
If the car is running fine now, it is difficult to say how much you damaged it. But it definitely shortened the life of the clutch! When burning the clutch it can also cause a shiny surface on the disc so it will slip more easily in the future also! However, clutches nowadays are kinda tough and can withstand a lot of stress, so it may work for several years more but is difficult to say.