Could be either one. I dont know how you can drive it that way? LOL When My 5.4s lost a cylinder they had power loss like it dropped 5 and shook like crazy. Back to your question. A scan tool will tell you which cylinder(s) it is. If it has been missing off and on you might have to clear old codes,drive it a bit then rescan. My experience is it will be ignition the vast bulk of the time. The scanner will not tell you why the cylinder is missing. That you must diagnose and there are two routes, the fast and more expensive way, and the slow but cheaper route which involves moving parts around to see if the miss moves. In my opinion the best compromise involves first installing a new set of plugs. if the miss remains, scan it t find the cylinder and switch the col pack from that cylinder to another, if the miss moves replace the coil pack, if the miss stays at that cylinder you check the injector circuit with a noid light and if the pulse is there you replace the injector,,, just the way I have done it. Only once have I had a bad fuel injector in 600,00 miles in 4 different 5.4 F-250 trucks.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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