2005 F150 5.4L... I have been experiencing a shudder/misfire in the 1200-2000 RPM range. I took it to the dealer and they informed me that this is a characteristic of Ford and that all Ford engines have this vibration/shudder. I find this hard to believe since it is a sympton that started about 5K miles ago.. I have 15K onthe truck. I is really pronounced under a load and is definetly isolated to RPM not a specific speed. There are no error codes (so I'm told). I believe that the dealer is either unable or unwilling to properly diagnois this problem. HELP!

 

Find another dealer.

 

go to autozone and have them plug their computer up to it to see if you have a any misfires.

 

my shift schedule for part throttle shifts me at low speeds and i get the same annoying lugging at 1000 to 1400. and i have it in a car. i just turn off O/D so i don't keep listening to it.