defiance

While letting the car idle, if I go and listen to the exhaust it seems to sputter every so many seconds or so, almost like its timed. Sitting inside the car i can feel it from the exhaust vibration everytime the sputter occurs, I get a like a surge through the exhaust. Other than that, the car runs fine. I am thinking its the sparkplugs, but wouldn't i feel it all the time and not just idling? Any input will be appreciated.

P.S.
The fuel filter was changed 4k miles ago
I cleaned the throttle body, and followed the manual on re-learning the idle.
Sparkplugs were changed about a year ago(10-15k miles or so) they are Bosch (when i bought them I had no idea that they dont always run right in our engines with the waste spark used), so I am thinking that's the cause of the problem, but the car runs fine when not idling.

2005Redfire6

My car does the same thing but I don't think its much to be worried about if it doesn't effect how the car runs...

defiance

I was really hoping for a cure lol as it is rather annoying, I guess if no one chimes in with one I will just set my idle higher with my tuner. Should change to Autolites anyways instead of Boschs?

2005Redfire6

I'm running autolite 5143's and mine still does it, but I have a supercharger too. So I don't know if that makes a difference?

defiance

Ahh man, I really hope this is not the nature of the beast..... I dont think your supercharger would do that, if anything I always thought one would make it idle better. But then again I'm not an expert at superchargers by any means.

Nuke

I'd run 1 or 2 tanks of SeaFoam or Techron first to see if it's a simple fuel system cleaning that's required. Always try the simple things before replacing hardware.

Whitehorse10

Why didn't you just use the motorcraft spark plugs? Just curious.

alkemist

Do you have a CAI? If you do, check for any leaks.

defiance

Well im a big believer of "getting what you pay for" saying, so figured the bosch would be a better plug, but that's apparently not always the case.

I dont have CAI, just stock, after checking today everything seems to be pretty tight.

kc5mhb

Not that there is any correlation but the 5.8 in my Bronco loves copper plugs and hates platinum. The 5.8 misfires with the platinum.