I have a 1999 Chevy Astro Van that has a very rough idle and lacks power.
The sevice engine light is on and I checked the codes. It is showing misfire cylinder #4. When I look at the datestream the #4 cylinder is missing throught the rpm range.
I've replace the spark plugs, cap, rotor and plug wires. It continues to miss. If I turn the #4 injector off it makes no difference and runs the same.
Anyone have recommendation as to what I should check next?
Thanks