Take one out and look at it. See if it's getting fouled up. Other than that just normal things like knocking.

 

Ill see if I can check them later at work. How would I tell if they are fouling? This is the first vehicle I have ever owned to last long enough for new plugs.... A sad commentary on my previous 3 vehicles

 

I've got a set of the E3s an haven't had a bit of trouble yet. An I'm runnin a 60k coil. Only have bout 2k on the motor so it's hard to tell how they'll last.

 

Mine didnt occur after the tune up, it occured months after the tuneup. I think my problem is a faulty iac valve. I'm going to get a new one today and seafoam my vacuum system before install.

 

Was unable to check today, but maybe tommorow. Thinking about buying me a heat gun and checking to see if I can find the cylinder that is not firing. This is really getting aggravating

 

Your IAC valve wont have anything to do with it...all that controls is your idle.

 

FIXED IT! It was a combination of two things. First, my IAC wasn't working right, my idle was about 950 rpm before, and 550 after replacing it. Also, that and the fact that the platinum plugs were causing one of the front 3 cylinders to have poor spark caused my rough condition. All in all, yesterday I replaced the thermostat with a 195 degree, flushed the coolant, ran a whole can of seafoam through the engine, replaced all my plugs with coppers gapped at .055, and replaced the IAC. Now it runs like a top, and it cost me 65 dollars all said and done.

 

Good deal guy. Glad to hear it's fixed. Did you set your idle when you put the new iac on? Your sposed to unplug the iac with the engine off, start it, adjust the idle with the stop screw on the throttle body to about 600 then shut it down and reconnect the iac. Then the ECM will learn what idle it needs to be at.

 

You should never adjust that set screw in my opinion. I unplugged the battery while doing all the work, which resets the computer, and after install I hooked it back up and the computer will relearn the sensor position. My truck idled high for a second, then lobed around, then the idle held steady at 550 rpms.

 

Actually my buddy at ford told me that. You'd have to adjust your tps after but that's easy