I keep getting a misfire from cly 4. I have changed both coil packs, all spark plugs, and wires. injector on that cyl. had all injectors cleaned. I talked to ford they say it could be the rockers on that cyl. Could it be anything else have you had a problem like this what fixed it thanks. 1998 ford f150 4.6 triton 146,000miles

 

Have you ran a compression test on that cyl. Is the miss intermittent? If not could be a bad lobe on the cam, bad lifter, push rod, or rocker. check the rocker movement on both valves of that cyl and compare to a good cyl.