ok so my issues is my van is hesitating and backfiring alot. i took it to auto zone to have a test done, and the reading from the test gave us this code P0304. Definition cylinder misfire detected - cylinder #4. i replaced all the plugs so far thinking that this would do the trick. however it did not, i need help figuring out finding what the problem is and how to fix it. if you can offer me any light on my situation i would be very thankfull. my van is a 1999 dodge grand caravan 3.8


thank you

 

Welcome to DF
You could have a bad plug wire. Try replacing the wire and see if it clears up. Or replace all the plug wires.