P0304 CHEVROLET -

Question

98 chevy fullsize trucks with 5.0 motor i have a code po304 at idle for two mins the engine light soon come on ,so i check for air leaks,didn't have any ,so i went to the next step is new plugs,wires,cap,rotor but the light will come back on so what is the next things to do

Answer 1

Hi there,

I would next check the engine compression on that cylinder. If it's low you can get a misfire code. I have at times seen weak valve springs cause single cylinder codes like this.