Question

2004 Suzuki Aerio 2.3L with engine code P0304, changed plugs, the coil pack, tightened the air intact claps

Answer 1

P0304 Misfire number 4 cylinder

A leak down test or a compression test should be performed to help determine if the cause of the misfire is mechanical related. ,

Answer 2

P0304 Suzuki Code - Cylinder 4 Misfire Detected
Read more: https://www.autocodes.com/p0304_suzuki.html