code P0304

You have to work through a diagnostic procedure. Start with a compression check, if good now check ignition components on a scope, the scope will also be able to detect a possible vacuum leak, if spark lines all look good and no vacuum leaks the next step is fuel. ohm out injector 4 or swap injectors and see if the misfire moves to a different cylinder. You can also swap spark plugs and wires to see if the misfire moves to a different cylinder if you do not have a scope. Physically inspect spark plugs for signs of coolant or other contaminants. Check your long and short term fuel trims using your scan tool, this will tell you if the computer is correcting for a rich or lean condition. These are some basic steps it may get more involved at that point I would take it to a Gold Shield Station

Misfire in #4. Plugs due every 40K, you could pull one to check them. Hows the coolant? Full, never overheated? Did you try to clear the code?

the p0304 is missfire on #4 cylinder ,if u want we do free check engine light inspection so call us or bring it in and we will look at it thanks pete