The computer said misfiring in the fifth cylinder... I can't even notice a thing by driving it.. What could it be?? Do you think it will hurt it to
Keep driving it?

 

if the CEL is on or comes back with the same code "P0305" after you clear it, then it should be addressed regardless of whether you notice it or not. start with the spark plug and if it looks fine you can swap coil packs...see if the misfire follows the coil to the new cylinder.

 

The only thing I could possibly add to this excellent advise - if the plugs are close to being "due" might as well replace all of them.

Thank you Jeff....

 

Yuppers

 

I've heard quite a few stories about spark plugs becoming loose, and destroying the threads in the head. Most of them have been on cylinder #5. Check the plugs.