i have a 2008 silverado, with 205,000 miles on it. The engine light came on one day *flashing* when i was driving, and it idles rough, and shakes. Shifting from 1st to 2nd jults the truck hard. I had the code read, misfire on cylinder 4. Changed the plug, coil and injector, along with wire. replace it all, and it isn't fixed. Light still flashing i went to have the code read, and it just said cylinder 4 was misfiring. Anything helps, its been a frustrating couple of days. Thanks