I'm sorry but "dropped a tanks" isn't familiar. Do you mean he took off the mufflers or resonators? If yes, then those are likely not the cause of the problem. The 3.6 has it's share of problems and one of them is in the valve train. Here is a question. When you start the engine and listen close with the hood open do you hear any rhythmic ticking noises? If yes then the misfire is probably the result of one of the camshaft followers failing, which is unfortunately a very common thing on that engine.
This video covers the problem:
https://www.youtube.com/watch?v=OIzJiKLjGt0
The thing is that as you replaced the coil and plug, that leaves the injector but those are actually pretty rare failure items. The same cannot be said of the followers in the valvetrain.
David has a few videos on this issue and how to inspect for it and repair it.
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Tuesday, May 28th, 2024 AT 5:22 AM