1999 ex

I have a 1999 Honda Accord EX with a 2.3L motor, automatic trans. Car began running rough about a month ago (son driving). Was dying occasionally, and finally died and will not crank. Reading the codes, I found P1259, P0420, P0301, P0300. P1399, P1259, P0430, P0705, & P0706. The spark plug...

I've had this Honda for a while just reached 15k miles. It's a 4 cylinder I noticed that the MPG has decreased badly, I haven't really had the money to fill it up all the way and I only use it about 2 times a week for school,but from the last 3 times I have added gas it has been decreasing. The...