Honda Accord '03 Stutter/Shaking?

So this has been an ongoing problem for a few months, but seems to be getting worse recently. I have an automatic '03 accord (I believe it's an ex?) vin number is 1HGCM566X3A010867. It started off with a slight stutter, similar to the way a car acts when it's running out of gas. It seems to be happening more at lower speeds between 35 and 45 mph. From looking at the tach, it typically happens between 1500 and 2000 rpm. I've taken it to my local auto shop and they have no idea what it could be. There are no check engine lights currently, but about a month after I bought the car it did have a check engine light come on. The code was P-0420. After we cleared that code at auto zone, it hasn't come back on. So far, we've replaced the brakes and pads, spark plugs, cleaned the throttle body, and done an oil change. I have absolutely no idea what's going on. Any help would be greatly appreciated, let me know if you need more info.

My parent buying me a car before I get my license?

I'm 17. I'm eligible to get my license October 9th and my birthday is December 9th. I was looking for cars even though I have a couple more weeks but to get myself prepared, to learn more about the responsibility of having one, the cost and insurance. I'm not looking for anything expensive or brand new because I'm paying for my car all by myself just for 2 months. I have 2 jobs and a senior in high school but I love it.
Anyways. I came across a 2000 Honda Accord and a 2002 Toyota Corolla from cars.com which I believe they are calling my name! Haha! But I wanted to buy it as soon as I can before anyone claims it. My dad is my legal guardian and has custody of me. He wants me to get a car and my license so bad because of me having 2 jobs and he's always too busy so he'll pay someone to take me to work sometimes. So he couldnt wait til my birthday. I was wondering if he could purchase the car and then when I get my license or when I'm 18, it could be in my name or my name on something? I don't know much about leasing and he actually doesn't know the answer to this question for a minor (BTW I'm not buying it in cash) but please help! I need more info!

I bought a 2007 Honda Accord Lx. NO AUX?

I bought a 2007 Honda Accord Lx. NO AUX?

Added (1). It has an aux system but not the input. I was wondering if i went to a dealer or mechanic how much would they charge to put a aux input in

About to buy a 1990 Honda Accord (First Car)?

I'm about to buy my first car, a 1990 Honda Accord for a rack, the Car is in good condition i just need to fix the passenger door. But I don't know about maintenance. What are the habitual duties I need to do in order to keep the car s life long and prosperous.

Can I register my car at the new york Dmv?

I just bought me a honda accord ex 1996. Insurence is too expensive. So my aunt is going to insure it for me. So her name is gonna be on the title as the owner. Can i go to the dmv to regsiter the car if the papers are sign and have a copy of her license?

don't tell me to call dmv because they never answer