I have 3 F-150 sitting in my drive way at the house, so I do a good be of repairs and work on them but my mom has a 2003 f150 4.6L and she had a coil pack go out and he check engine light come on so i pulled the code and replaced it, a few days later the light went off again on the same piston so i replaced the spark plug, but now it is still shaking and i have taken it to a mechanic and he said there is not huch he can do till the check engine light comes on again Any ideas on what i could do?

 

Stop take a deep breath....ok start by turning on the engine and carefully unplug each cop ONE at a time till you find the dead coil. You will hear/feel the change in the engine when you unlpug a good coil...when you don't hear/feel a change you have found the dead cop

 

thanks man, it turned out the be both the number 5 cop plug and plug (that i replaced) and the number 8 but the code reader only registured the 5