1, engine oil! Because burning engine oil will make the engine unstable, the power performance will deteriorate, and a lot of carbon will be produced. So your accelerator was working when it was cleaned, but a week later it was beaten back to its original shape because of a large amount of carbon deposition caused by burning engine oil!

2, spark plugs and high-voltage lines and high-voltage lines are faulty! For the same reason.

I hope this helps.