ejconcepcion

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