I replaced the #3 plug and it's still giving me the P303 code. I don't know where to go from here. I replaced all 6 plugs and coil packs last year.

 

So last year you replaced all spark plugs and all coils.
You are now getting a misfire code P0303 for misfire on cylinder three.
You replaced cylinder 3 spark plug again.

Did you clear codes after you replaced the spark plug and then the same code returned?
How good are you at electrical diag?

 

Thank you for your reply. I am new to auto repairs. Don't know much. I am going to replace all my fuel injectors and see if that helps.

 

You originally said you didnt know where to go next, do you want help with diag or do you just want to throw parts at it?

 

It will not be your injectors. What i see happen is people replace their plugs and they have carbon tracking down the outside of porcelain. So they still have a miss, as the carbon is also on the inside of boot. Then they replace the coil, but the carbon track has already transfered to the plug, so it still misses. So pull plug and look at the outside of the plug and inside of coil boot for a straight carbon track