My car is ________ again, I don't know what's wrong with it.

• শূন্যস্থানে সঠিক উত্তর হবে - acting up.
- Correct sentence: My car is acting up again, I don't know what's wrong with it.

• Act up একটি phrasal verb.
- English Meaning: To behave badly/ to operate badly:
- Bangla Meaning: খারাপ আচরণ করা/ খারাপভাবে কাজ করা।

Source: Cambridge Dictionary.