96 ford ranger what is code po304

Question

What should I look for with code po304

Answer 1

P0304 Misfire number 4 cylinder

When there is a misfire of a cylinder that cylinder is not contributing, this can be from its sparkplug wire to the sparkplug , to mechanical condition, inspect that sparkplug condition , and note its condition ,  Here a sparkplug that was fouled lead to a misfire, the one on the left is new compared to the other 2 that are fouled