so my 2000 F150 v8 5.4 triton is a great truck as I think anyone with one with one will agree. The only recurring problem seems to be the coil packs will go bad all of sudden, causing misfiring and a very bumpy ride. When this first happened a few years ago, I replaced them all and the truck was good for 3 years. The 1 and 3 coil went bad last winter, I took it to STS and just had those two replaced, and the truck was still running rough, so I took it to a buddy and he said they replaced the coils but not the plugs that go with those coils, so he just replaced the two spark plugs on those coils and it was fine (very inexpensive fix and it was one of those where you are like, wow thats all it was!). All of a sudden this week the truck is running rough again- so i take it to my new mechanic (who i think i can trust) and he replaces the #5 coil, says another one is going but he cant isolate it yet, and they all should be replaced at once. 8 coils @ $120 plus $75 in labor for each one and we are looking at alot of money I dont want to spend. I drive the truck off the lot and it runs great. Two days later the check engine light is back on and its running rougher than ever! Should I have him just replace the bad coil or all of them? And should the spark plugs be replaced also? Im so confused over these darn coils!