I have an annoying misfire that I can't seem to find. The first code was a misfire in cylinder 4 detected. Changed the plug, no luck. Changed the coil pack, no luck, Switched the #4 wire to another cylinder, no luck. Now the code says random multible misfires detected. The plugs,(double platinum Autolite) and the wires have been in for 32,000 miles.
It idles fine but starts to miss under load. What direction should I go ???

Thanks,
edford1