2005 crew cab fx4 5.4 3v when riding along at 45-50 when you ease in to the gas it feels like you hit a rumble strip. Any ideas

 

Mileage? Original plugs? Could be spark plugs or trans. Need a bit more info

 

Sounds like a cylinder misfire, but as already stated, need a little more info.

 

My thoughts exactly. Sounds like the typical plug symptom of the 5.4

 

truck has 104000 miles on it. it was just bought so not sure about the sparkplugs

 

Tune up time buddy...what your feeling is a mis-fire...CEL flash at all ?? plugs need to be changed @ 100K so...your over due.. get your wallet ready

 

Okay well to check if the plugs are original pull off a coil and look at the plug. If there's a pink (I believe it was pink) dot on the end then they're original. If you want to find out for sure take it for a full diagnostic. They'll be able to tell you what's going on. Not sure how much it'll cost you though