Ok the truck runs fine when the weather outside is cool but when the temperature gets up my truck rattles under load, the other day I was pulling my rzr and it got so bad it started missing the threw the misfire on cylinder 2 code, note that I just put 8 new motorcraft plugs in it, is it my phasers or my vct, on the vct note it does fine at idle just a slit miss.

 

What are you driving? We can't see it through the Internet.

 

Sorry just assumed with me talking about phasers you would know it was a 5.4 3V..lol

 

That's not the only Ford engine with phasers. What YEAR is it and in what kind of truck? How many miles on it? What weight oil and brand oil filter do you use?

Seriously, whenever asking for advice in a forum, please post details.

 

04 f150 5.4 3v 157k motorcraft 5w 30 with the motorcraft filter every 3k since I've had the truck,until the last oil change which just the other I tried the rotella 5w 30 for gas engines just to see how it does

 

Just wild guessing here. Perhaps the knock sensor is not working properly?

 

You do have an issue if it's missing at idle. You may need one or more coils. Try some high octane fuel and see if that makes a difference, it also would not hurt to put some Techron in the gas.