hard starting

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The truck cranks longer than usual about 100% of the time, which tends to happen after it's been shut off for at least 15 minutes. When the hard-start happens the engine also often "stumbles" into a start and then has a rough idle for 10-30 seconds. After that, it runs and drives fine. The only time it doesn't seem to have problems starting is immediately after it's been shut off. Wait 15 minutes or longer though and it almost always has trouble firing up. When I took it to the dealer the first time they said it was showing an extended crank code and also a random misfire. They recommended I have the spark plugs changed, replace the coils, new fuel filter, and clean fuel injection. The problem still exists!