This has happened once in the past. It turned out to be the spark
plugs.

I do see some low transmission fluid when I checked it last.

What I want to know is which transmission fluid I need to add, and how
to add it.

Also, I've heard horror stories of honda accord's transmissions
blowing up. What can I do on a daily basis to prevent the transmission
from failing.

The mileage on the car is about 140000. I got it at 119000. The last
owner said the timing belt was changed. How frequently does it need
changed.

Any recommendations for parts for the Honda Accord ? A website or
something.

Any help will be appreciated !

Thanks,

awesomecarproblem