Nissan Repair Questions? Ask a Mechanic for Answers ASAP
If the truck runs rough at idle, check it for an intake manifold leak on or near #5. Take some carb cleaner and spray it around the intake while the engine is running. If the idle smooths out or speeds up, then you have an intake leak.
If that's good, then with all you have done so far, I would do a compression check. It's possible there is a fuel issue causing the long crank, but it's not going to cause this problem with a single cylinder misfire. So, I would try and resolve that first. As for the knock sensor code, if the intake is leaking, then you could replace it, otherwise, don't worry to much about it. It won't cause the check engine light to come on and really won't affect the engine.
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Well, in that case I guess about the only other thing you could do is put a noid light on the injector and make sure it's firing like it should. Otherwise you have a perfect engine with a misfire which really doesn't make much sense. Usually don't see a single cylinder misfire like this from ignition components that have been replaced.
Can you confirm which cylinder is #5 for me please?
Ok, I am going to open this back up for the other experts. The most common issue would be with the intake, if that's not the issue and the leak down didn't provide any indications of the problem, not sure what to do next on it. I had to ask about the cylinder id just in case, but you do have the right one.
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What brand spark plugs did you install in the truck?
Glad you found the problem. Injectors are extremely rare.