Hello all Im new to F150 forum. I have a problem my truck started running rough a couple months back and I thought it was the transmission which was only the surface of the problem. I have had the transmission replaced along with all the COPs. The truck ran like brand new for two days after i changed the COPs then it went right back to running rough and now runs worse than it did before. I went to Autozone and had them hook up the computer and it said that cylider #6 was the problem so i replaced that one with a new COP and its still running like crap. If I open the throttle more than half way it begins to shutter and you hear a snapping noise almost like electric and smoke comes out the tail pipe but then if you let off the gas to under half throttle it runs fine, makes it really difficult to pull out into traffic, but as soon as you pass that halfway point it begins the shutter again. I almost feels like the truck has hiccups when trying to accelerate whether its from a dead stop or while already moving.

PLEASE HELP!! Im about to replace the valve cover with the built in PCV valve to see if that helps but if i dont have to spend the $150 for the cover Id rather not ive already sank a lot of money into this truck and my fiance' is about ready to put a bomd under it! The truck has 110000+ miles on it and just started falling apart.

 

Whan was the last time the plugs were changed?

 

the plugs last got changed about 3 or 4 years ago.

 

How many miles ago?

 

the truck only has 110,000 give or take and i bought it with 36,000 so I would say was around 20,000 or so ago

 

If you confirmed that the coil is fine, try putting a new set of plugs in it.

 

If this is a 05 with a 5.4, you probably have one or more stuck fuel injectors.

https://www.f150online.com/forums/v8...ram-07m08.html