I have a misfire on cylinder #4 2006 H3, new spark plugs, cleaned throttle body, swapped the coils to see if the problem follows, but problem still exist..Code is P0304....any suggestions?

 

Did the exact same, 06 same issue at 20k miles drove till 50k aprox then did leak down to find 2 half dead cyls. Read above post...

 

This was MOVED from the recall thread (about HVAC wiring connections) because it has nothing to do with that topic. You want to ask a new question, post it in a new thread.

Do a leak down test, or make sure the plug in #4 is not broken/cracked.