Ok so I have so far replaced the COP's and the plugs and it was running good for about two hours and now its back to running rough just not as bad the truck has a little bit of rough idle but when you hit the gas to go it stops and the strong gas odor is back again it spudders a little bit around 50-60mph but if i turn the O/D off it doesnt do it as bad just when the RPM's are around 1000 like when it shifts into the cruising gear (O/D) I can also still feel that it doesnt have the power it used to with acceleration. I got a lot of help the first time and I'm hoping you guys can help me again cause im about ready to blow up this truck.

The truck is a 2004 F-150 with 110,000+ miles it has the 5.4l 3v engine.

 

Clogged cats.