I'm getting a shudder at around 40-45 miles per hour when I let off the gas and then let the rpms die down a little and then i slowly push the gas pedal back down and it shudders. If I do the exact same thin but push the pedal down faster or put it to the floor everything is smooth and I don't have a problem.

Anyone know what this could be?
(04 F150 2wd 4.6L V8)

 

V8* Im not sure why it put a smiley face

 

Can anyone please help me with my engine problem?

 

doubt its the motor...sounds like drive train...rear end/u-joints...maybe ever the torque converter

 

Do you know anyway that I could test my truck to find the culprit of the problem?

 

you are taking it in & out of overdrive, stop looking for problems.

 

Actually I never use the overdrive on my truck, I only use it when I accidentally hit it with my hand. I'm trying to diagnose the problem before it becomes worse and turns into a huge problem to fix and a problem that could possibly become more expensive

I'm looking for an opinion or a thought on what someone thinks it could be, I'm not looking for someone to play my dad and tell me what I'm not supposed to do with something that I bought

 

Had the exact same thing happen to me, scared the crap outa me. I thought for sure my tranny was dying. I let it go on for a month before i researched it. Turned out to be the spark plugs.... No codes popped up but sure enough after I swapped them she ran smooth.

 

yeah...a mis-fire from a bad or several bad plugs would normally throw a code and not be isolated to a certain RPM..

 

How many miles on the engine/spark plugs. I had and older truck (but with different ignition system than these) do something similar that was plug related.

Have you done other basic trouble shooting? - Such as cleaning the throttle body and MAF sensor (with appropriate cleaners)?