What is this plug and I’m guessing it’s not suppose to be oily like that? This is on a 2005 5.4 it’s right beside the oil.
Just another pic
Also my truck has a miss when it is idling it doesn’t do it all the time and runs fine down the road. Once the truck gets warm it has a miss sitting idleing

 

That’s the grommet for you pass side VCT solenoid. It can be changed out if you wanna clean up the mess. About your miss... Any codes or check engine light?

 

Yes I’m getting a multiple cylinder misfire code. And it seems to only miss while idling not while accelerating

 

When was the last tune up done? More specifically spark plugs.

 

I’ve never had a tune up done. I bought the truck from a guy who had a new motor put in it the motor has about 40,000 miles on it now so it should have about 40,000 miles on the plugs

 

The two most common causes of misfires on these engines are spark plugs and boots/springs on the coils. I would do both of those items. Use Motorcraft plugs but any brand of boot/springs that look identical to OEM b/s will work. I'm not a betting man but I'd put money on those things fixing your misfires.

 

I would also look at throwing a new VCT and gasket on there too...that's a lot of moisture coming off that valve cover.

 

Update: I haven't done anything yet, but yesterday I drove the truck to a family event and it got good and warmed up and had no issues with missing while going down the road. I get where I am going and turn the truck off then I see a better place to park. When I go to start the truck, it turns over, fires, sputters then quits. It done this 3 times. On the third time it sputtered, but started. I moved the truck cut it back off and it sat for about 2 hours. I went back outside to leave and it started up fine. I got home and checked for codes and got the P0300 code. That's the only code I had.

 

Very likely it's a spark plug issue. Hotter coils and New Old Stock injectors didn't change my misfires (definitely did help torque and spark timing under load), i'm hoping finally getting some SP546 plugs will fix the mess.

 

Was the motor 'new', in the sense that it was rebuilt/remanufactured? Or, was it possibly a low-mileage swap? I only ask because, if it was a used motor pulled from another truck, there's no guarantee that the plugs were changed. Devil's advocate here...